Mole and Vole Control

This page covers what a householder can actually do about moles and voles, using only what university extension services and one EPA-registered product label publish. Where those sources disagree with each other, the disagreement is set out rather than settled. Where the law puts a method out of a homeowner’s reach, the page says so and names nothing.

Five products are named. Every link on this page is a plain product link: PestPro Index earns nothing if you buy any of them, and each card says so immediately above its own link.

Which Animal First

Moles and voles take different tools, and pocket gophers take different tools again. A mole is not a rodent and does not gnaw; a vole is a rodent and does. Getting this wrong wastes every step that follows, because a mole trap set in a vole runway catches nothing.

If you have not already settled which animal you have, do that first. Our mole, vole or pocket gopher identification page does nothing but tell the three apart from the marks they leave, and it is deliberately separate from this one. Nothing below will help if the animal is the wrong one.

Trapping Moles

Nebraska Extension puts trapping ahead of every other method for moles, describing it as the practical approach that works, and says the common trap types can all produce good results. Those are our words for the ranking; the publication states it more strongly, and we have kept the ranking without the superlative. UC IPM reaches the same place from California and states it directly: “Trapping is the most dependable method of mole control.”

Nebraska names the types: “The most popular types of mole traps include the harpoon (Victor® or AnneMissille®), scissor-jaw (Out O’ Sight®), choker-loop (Nash® or Victor®) (Figure 4), and NoMol® traps.” It also states that “Mole traps usually result in quick kills and with reasonable caution, are safe for the user, pets, and other wildlife.”

One sentence in that publication is the only countable product criterion anywhere in the sources this page uses: “We recommend homeowners employ at least three traps when trapping for moles to increase the chances of success.” A single trap is not what the source recommends, so a single-trap listing is not what is named here.

On where and when: Nebraska says traps are usually set in surface burrows, that success is highest when they are set in burrows that are in use, and that “If they are not successful in two to three days, move traps to a new location.”

Live trapping, and one state’s rule

Nebraska Extension recommends against live trapping moles, and its reason is a legal one specific to that state: “If successful, however, you must either euthanize the mole, or release it within 100 yards from the site of capture, as Nebraska regulations require. Since releasing it will result in renewed damage to your property, we do not recommend live trapping.”

That 100-yard figure is Nebraska regulation, stated by a Nebraska publication. It is not a national rule and this page does not present it as one. No source consulted for this page addresses trap restrictions in any other state, so none is offered. Yours may differ, and this is not legal advice.

Trapping Voles

UC IPM sets a condition on vole trapping before it sets a method: “When voles numbers are low or when the population is concentrated in a small area, trapping can be effective.” The tool itself is ordinary. UC IPM: “Common traps include standard mouse snap traps.”

On placement, the two sources agree. UC IPM: “Place the traps at right angles to the runways with the trigger end in the runway.” Penn State Extension: “Set mouse-sized snap traps at burrow openings or in runways near ornamental shrubbery, flower beds, gardens, or rock walls.”

On bait they disagree, and both are given here. UC IPM says traps “can generally be left unbaited, as voles will cross the trap as they run along their runways. If bait is desired, a peanut butter-oat mixture or apple slices often work well.” Penn State says to bait them: “Bait the traps with a peanut butter-oatmeal mixture or apple slices.” Neither is corrected against the other and neither is averaged, because both are published instructions from extension services and this page has no basis for preferring one.

Castor Oil Repellents

This is the section where the sources disagree most, so it is the section with the most words before the product. Castor oil is an active ingredient permitted in exempted minimum risk pesticide products under 40 CFR § 152.25(f), Table 1, listed as CAS 8001-79-4 — subject, in the regulation’s own words, to all the criteria of that section being met. It is not a restricted product and no source consulted for this page records a pet, child or wildlife hazard for it.

What the research actually says, all of it

The one controlled field study is positive. Dudderar, Tellman and Elshoff of Michigan State University tested a product containing 65 percent castor oil and reported to the 7th Eastern Wildlife Damage Control Conference in 1995 that “Mole activity as indicated by raised ridges ceased on eleven treated sites but continued on 5 of 6 control sites”, and that “The effectiveness of the repellent as indicated by the lack of new ridges continued for 65 days on one treatment site and for 30 days on the remaining treatment sites.” That is eleven treated and six control lawns in southern Michigan, on eastern moles, with one named product at one concentration, thirty-one years ago.

Nebraska Extension, revised January 2010, is lukewarm. Its words are that castor oil products “have shown minor effectiveness in repelling the eastern mole”, and it cites one study in which a castor product “successfully reduced mole activity in an area for over 30 days.”

Purdue Extension, revised April 2005, is not persuaded. “Some success has been reported with these products, but no scientific research has shown a consistent result.”

A WSU Extension educator in Snohomish County tested one and it did nothing at all. Writing in the Mole Hill Gazette issue stamped 04/07, on a granular castor product applied repeatedly through February: “Throughout the test there was no change in activity. The mole kept returning to the application holes and plugging them up!” One site, one mole, one observer, one granular product, in western Washington — and that last detail matters, because of the next paragraph.

UC IPM, updated November 2024, marks the boundary of the evidence: “Research on the effectiveness of these castor oil commercial repellents has shown some efficacy for eastern moles. No published research has been done on moles in the western United States, so their effectiveness on these species remains unclear.”

These four positions are not reconciled here. They were published by four different institutions across nineteen years, they are all still in circulation, and averaging them would produce a number none of them stated.

What a repellent does even when it works

UC IPM is blunt about the mechanism: “repellents work by moving animals from one location to another by deterring their presence in the area where the repellent is applied”, and so “they may have limited utility in residential areas, as ‘repelled’ moles will simply move to neighboring lawns and gardens and will continue to cause damage in these areas.”

Two conditions that decide whether it works at all

Nebraska states both as requirements rather than tips. “To be effective, the castor oil product must be thoroughly watered into the lawn. Irrigate the area to be treated with one-half inch of water before applying the repellent solution, and follow up with 1 inch or more of water.” On coverage, Nebraska instructs spraying the entire area to be protected rather than a strip around its edge, and gives the reason in its own words: “Moles will burrow under a perimeter treatment.” Nebraska adds that “Areas that receive extensive irrigation will quickly lose the repellent to leaching.”

One more finding decides which form to buy. Nebraska: “Preliminary studies on granular materials containing castor oil have shown less effectiveness than the liquid repellents.” The product named below is a liquid, and that is why. It is also the reason the WSU field failure above is not the whole story: the product that failed there was a granular one.

The One Mole Bait a Homeowner May Buy

Most poison baits do not work on moles for a simple reason. UC IPM: “Because the mole’s main diet consists of earthworms and insects, poisoning with traditional grain-based baits is rarely effective.” Purdue says the same of “most poison baits (nuts and grain pellets)”, which it says “provide inconsistent results.” The worm-shaped baits exist to answer that, by imitating the food the animal actually eats.

The grain bait that does exist for moles is out of reach anyway. Nebraska: “A 0.5 percent formulation of strychnine grain-based bait is federally registered as a Restricted Use Pesticide for controlling moles.” The worm bait is not. Nebraska again: “(Tomcat, as the retail version of Talpirid, is a General Use Pesticide)”, and it is “a synthetic worm replica that contains bromethalin.” The EPA-registered label states the concentration: “Bromethalin (CAS #63333-35-7): 0.025%”, under EPA REG. NO. 12455-101.

Purdue Extension adds a hazard the label implies and a reader might not: “baits exposed on the surface are not readily consumed by the moles and also pose a hazard to other animals, such as dogs, cats, wild birds, and squirrels, which may consume them.” Nebraska’s closing instruction on the whole category is worth repeating exactly: “Carefully follow the label when using toxicants and fumigants, as the label is the law.”

The secondary poisoning question, worked through

The obvious worry is a dog or cat eating a poisoned mole, or digging up the bait. Purdue Extension’s wildlife extension specialist worked it through with published toxicology in June 2020 and concluded against the alarm: “It would be extremely unlikely that a dog could find, dig up, and consume the number of worms to reach or even approach the average lethal dose.”

The arithmetic behind that, as Purdue sets it out: each worm bait carries 1.25 mg of bromethalin, and against the published dog figures — 4.7 mg/kg for technical bromethalin and 2.38 mg/kg as formulated in bait — an 11 lb dog would need roughly 18 to 19 worms at the first rate or 9 to 10 at the second. Young dogs are sensitive at around 1 mg/kg, and cats are 2 to 3 times more sensitive than dogs.

Purdue does not offer that as reassurance on its own, and neither does this page. It attaches conditions: “Applying the product according to label instructions (in underground active mole tunnels) helps minimize the risk of accidental ingestion”; “Allow at least two weeks (or longer under dry conditions) for breakdown of any uneaten worms”; and “In the case of mole toxicants, the label clearly states that pets should not be allowed in treated areas.” Purdue’s own conclusion is that the decision is the reader’s, and that if you are not confident the label conditions can be met, other methods are the better option.

Whether it works

UC IPM, updated November 2024, is the most favourable and is still hedged: “Although rigorous testing is still needed to better estimate its effectiveness, limited studies have indicated gel-type baits are more efficacious than grain baits and appear to be a viable alternative for mole control.”

Nebraska, revised 2010, reports experience rather than evidence: “We have received numerous positive reports regarding the effectiveness of Talpirid/Tomcat. However, more rigorous testing of these products is needed.” It adds a handling note that matters: “When using Talpirid/Tomcat, do not disturb the integrity of the worm-bait as it will interfere with its effectiveness.”

The WSU educator tested this product too, on one western Washington site, and the mole would not touch it. Each bait was staked so it could be recovered and inspected: “In every instance I could find no sign of feeding, though the baits were consistently walked over, buried, pressed into the tunnel walls or just pushed out of the run.” And: “In the end, all of the baits slowly dissolved away into the soil and the mole continues to inhabit the runs.” One site, one mole, 2007, and the bait was supplied free by the manufacturer — the author says so.

Why There Is No Vole Bait Here

Because a householder may not legally apply one. This is not a gap in our sourcing and it is not a judgement about whether such products work. It is the law about who may hold them.

UC IPM: “Currently, zinc phosphide is the only toxicant that can be used to manage voles in residential settings, although it should be noted that this is a restricted-use toxicant (i.e., those that require the applicator to be licensed or certified to apply the product).”

Penn State Extension, on vole toxicants: “These toxicants are restricted-use pesticides. Any person using these pesticides must be a certified pesticide applicator or work directly under the supervision of a certified applicator.”

Two extension services, the same position. So no vole bait is named on this page, and the vole methods that are named — the snap traps above — are the ones the same sources describe. Anything sold to a householder as a vole poison is worth reading very carefully against those two sentences.

One further class is settled and absent for a different reason. Nebraska, on electronic devices for moles: “Several electronic devices have been marketed, but none has been proven effective.” Nothing of that kind is named here.

What We Checked

Product listings on this page were chosen against criteria the sources published first, and then checked one at a time. The counts below are exact.

• Mole traps. Five listings were looked at. One supplies at least three traps in a single purchase, which is what Nebraska Extension recommends, and it is the one named here.
• Vole snap traps. Three listings were looked at and two are named, as the larger and smaller quantity of the same ordinary tool. Neither names voles in its own description, which is stated beside the cards rather than buried here.
• Castor oil. Four listings were looked at. One no longer exists — the page for it returns a not-found error, so it is not named anywhere on this site. One was rejected because its own description states no coverage figure, and without one a reader cannot follow Nebraska’s instruction to treat the whole area. Two met every criterion — liquid form, castor oil named in the listing’s own text, and a stated coverage figure. The one named here is the one whose title alone carries all three, so nothing about it has to be taken on faith from a marketing bullet.
• Worm bait. Four listings were looked at and all four met the criteria. They are pack-size and brand variants of the same product line from the same manufacturer, so one is named rather than four. The one named is the only one of the four whose own description carries both the underground application method and the North Carolina restriction.

What this page does not tell you is whether any of these is in stock today. A product title read on one day is an identity, not an inventory, and no claim about availability, price or delivery is made anywhere on this page.

Questions

Sources

1. University of Nebraska–Lincoln Extension (Dennis M. Ferraro, Stephen M. Vantassel, Scott E. Hygnstrom); peer reviewed. Moles and Their Control (NebGuide G1538) — the source of the three-trap criterion, the trap types, the castor-oil watering and whole-area conditions, and the General Use status of the retail mole bait. 1996, revised January 2010; accessed 25 August 2026. https://extensionpubs.unl.edu/publication/g1538/na/html/view
2. UC Statewide IPM Program (R. A. Baldwin, UC Davis). Pest Notes: Moles (UC ANR Publication 74115) — the source of the eastern-versus-western research gap, the repelled-moles-move-next-door statement, and the gel-bait comparison. Published 25 January 2022, updated November 2024; accessed 25 August 2026. https://ipm.ucanr.edu/home-and-landscape/moles/
3. UC Statewide IPM Program (R. A. Baldwin). Voles (Meadow Mice) (UC ANR Publication 7439) — the source of the mouse-snap-trap criterion, the trap placement, and the restricted-use position on vole toxicants. Updated April 2023; accessed 25 August 2026. https://ipm.ucanr.edu/home-and-landscape/voles/
4. Penn State Extension (Shannon T. Falker, Margaret C. Brittingham, Lisa Williams). Voles — the source of the baited-trap instruction and the second statement that vole toxicants are restricted-use. Updated 5 January 2007; accessed 25 August 2026. https://extension.psu.edu/voles
5. Purdue University Department of Entomology (Judy Loven, USDA-APHIS Wildlife Services). Moles (ADM-10, Wildlife Conflicts Management) — the source of the statement that no scientific research shows a consistent result for castor-oil repellents, and of the surface-bait hazard to other animals. Revised April 2005; accessed 25 August 2026. https://extension.entm.purdue.edu/publications/ADM-10.pdf
6. Purdue Extension Forestry and Natural Resources (Brian MacGowan, Wildlife Extension Specialist). Secondary poisoning from bromethalin toxicants for moles – should you be concerned? — the source of the dose arithmetic, the degradation window and the conditions attached to them. Posted 18 June 2020; accessed 25 August 2026. https://www.purdue.edu/fnr/extension/secondary-poisoning-from-bromethalin-toxicants-for-moles-should-you-be-concerned/
7. WSU Extension, Snohomish County. Mole Hill Gazette 04/07 — the source of the field test in which both a granular castor product and the worm bait failed on one western Washington site. Issue stamped 04/07; page posted 25 July 2013; accessed 25 August 2026. https://extension.wsu.edu/snohomish/2013/07/25/mole-hill-gazette-0407/
8. Bell Laboratories, via the WSU PICOL pesticide label database. TALPIRID product label, EPA REG. NO. 12455-101 — the source of every warning quoted in the bait section, the active ingredient and concentration, and the North Carolina restriction. Label retrieved 25 August 2026. https://picol.cahnrs.wsu.edu/DownloadLabel/43789/WA/WA_2026_12455-101_Talpirid.pdf
9. G. R. Dudderar, S. Tellman and D. K. Elshoff, Michigan State University; 7th Eastern Wildlife Damage Control Conference, pp. 149–152, Jackson, Mississippi. The Effectiveness of a New Mole Repellent for Preventing Damage to Lawns by Eastern Moles — the only controlled field study of a castor-oil repellent cited on this page. Presented 11 May 1995; accessed 25 August 2026. https://digitalcommons.usu.edu/wdmconference/1995/all1995/25/
10. Electronic Code of Federal Regulations (eCFR). 40 CFR § 152.25(f), Table 1 — the source of castor oil’s status as an active ingredient permitted in exempted minimum risk pesticide products (CAS 8001-79-4). Current text as retrieved 25 August 2026. https://www.ecfr.gov/api/renderer/v1/content/enhanced/current/title-40?chapter=I&subchapter=E&part=152&section=152.25