How to Keep Deer Out of Tomato Plants: Fences First, Repellents Second

ByKen

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Learning how to keep deer out of tomato plants comes down to one principle from both sources reviewed here: a physical barrier works best, and repellents are a supplement. Deer damage to garden crops is a common concern, and the LSU AgCenter article explains how fence height and layout make a difference, and an Ask Extension expert answer explains where repellents fit. Both are summarized below, along with the limits of what they cover.

Quick answer

  • Build a barrier first. The Ask Extension answer says physical barriers remain the most reliable protection.
  • Consider a fence of at least seven feet around the whole garden, or netting or hardware cloth wrapped around the tomato cages.
  • If you use a double fence, the LSU article describes two fences about five feet apart, with an electrified outer strand about 1.5 to 2 feet off the ground.
  • Use repellents as a supplement. Rotate them and reapply after rain.

Why tomatoes draw deer

The Ask Extension answer describes tomatoes as highly palatable to deer, which is why it recommends combining repellents with physical barriers for them. The LSU AgCenter article makes a related point about timing: once deer get a taste of the crop, it will be harder to discourage them. The sources therefore treat early protection as the goal, rather than a response after damage has happened.

The LSU article is written mainly for commercial vegetable and fruit growers. It notes that home gardeners sometimes face losses from deer as well, and that the design it describes can be used for a home garden. The scale changes the cost, but the logic of the barrier stays the same.

How fence height and layout work

The LSU AgCenter article gives the main structural rule. Deer can jump both high and far, so a fence must either be quite tall, at least 6 to 8 feet, while still covering the area close to the ground, or it must deter deer in another way.

The article also explains why some designs work. Deer have poor depth perception, and some fence designs take advantage of that. The example it describes is a two-fence system. Two fences run parallel and are five feet apart. The outer fence has one strand of polytape 1.5 to 2 feet above the ground, and that strand is electrified. The inner fence has non-electrified strands at 2 to 4 feet and at 5 to 10 feet from the ground. The article cites a Clemson University publication on this design, titled “Managing Deer Damage Using a Two Tiered Fence System,” which we did not open for this guide.

The article also describes a simpler alternative: a single fence slanted at a 45-degree angle, with the top farther from the crop and three or more strands. Like the double fence, it uses the deer’s poor depth perception. Polywire can replace polytape, though the article notes that polytape is more visible.

Keeping an electrified fence working

An electrified design only works when it is maintained. The LSU article says to keep vegetation low along the electrified fence. If grass or other vegetation touches the polytape, it can reduce or eliminate its ability to deliver a shock.

The article suggests a further deterrent. Peanut butter placed on small pieces of aluminum, spaced about every 30 feet along the polytape, is meant to give deer a shock when they try to eat it. The article presents this as a way to emphasize to deer that they do not want to mess with the fence. It does not say how often to replace the bait.

The article also gives a cost signal. More than half of the estimated total for a large fence goes to fiberglass poles spaced every 15 feet between corner poles, so a smaller garden needs fewer poles, while the solar energizer cost stays about the same. The estimate dates from several years ago, so check current pricing before buying.

Using repellents as a supplement

The Ask Extension answer treats repellents as useful but limited. It says repellents can help, but must be rotated and reapplied frequently. It lists several kinds that gardeners commonly use: egg-based products that are sold for deer, homemade egg-solid formulas found online, hot pepper (capsaicin) sprays, and predator urine, dried or liquid. The answer says egg-based products work because they mimic predator scents, and that hot pepper irritates the deer’s mouth and discourages repeated feeding.

The timing advice is specific. Rotate repellents every two or three weeks to prevent deer habituation. Reapply any repellent after rain, because most repellents lose effectiveness when washed off. The answer notes a downside: these repellents have a strong odor. It advises combining repellents with physical barriers such as netting, fencing, or cages, and not using them as the sole method.

The answer adds a labeling note for spray products. It says that if you buy a repellent spray, it should be labeled for use on edible crops, and that the repellent should be applied to the stake or around the tomato bed. This guide does not give application rates or safety steps for any specific product. Read the product label and follow it.

Putting a plan together

A workable plan for a tomato bed combines the two sources. Start with a barrier, and have it in place before or shortly after planting, as the LSU article advises. Use a tall fence around the whole garden, or wrap netting or hardware cloth around the cages if a full fence is not practical. Keep the grass and weeds low beside any electrified strand. Then add a repellent as a supplement, rotate products every two or three weeks, and reapply after rain.

Plant placement also matters. The LSU article says to maximize the distance between the plants and where deer have shelter. If deer must travel farther across open ground to reach the crop, they will be less likely to venture into the garden. This is a practical point that comes from a wildlife extension specialist speaking at a watermelon meeting, and it applies to tomatoes as well.

Related reading on this site: how to grow tomatoes in containers and how to stake tomatoes.

How we chose

We selected two sources that address deer and garden crops directly. The first is an LSU AgCenter article, written by Mary Helen Ferguson, titled “Preventing Deer Damage in the Garden,” dated March 25, 2023 and edited. The second is an Ask Extension question and expert answer about deer and tomato plants, asked June 28, 2026 and answered the same day. We opened both pages on 2026-10-27 and took every quotation from the retrieved text. We did not use retail pages or product listings.

What we could not verify

The two sources cover fencing and repellents. They do not offer a tested comparison of repellent products, and the Ask Extension answer does not report trial results. We could confirm what each page says, but we could not confirm how well any repellent or fence works in a specific yard. The Michigan State Extension tip sheet mentioned in the answer was not opened for this guide.

What the sources do not say

  • How much deer pressure a given yard faces, or how to measure it.
  • Whether a particular repellent product works better than another.
  • How long a fence should be kept in place after the season ends.
  • Exact replacement intervals for repellents other than the two- to three-week rotation.

Frequently asked questions

Is a fence the only reliable option?

The Ask Extension answer ranks barriers as the strongest option, with repellents as a support. The LSU article calls fencing one of the most effective ways to prevent deer damage, but it also notes that not every fence does the job.

How tall should a fence be to keep deer out?

The LSU article says deer can jump high and far, so the fence must be at least 6 to 8 feet tall while still covering the area close to the ground, or it must deter deer in another way.

Can I wrap netting around the tomato cages instead of fencing the garden?

The Ask Extension answer suggests hardware cloth or plastic netting wrapped around the tomato cages as a physical option. The answer does not say how well this works compared with a full fence.

How often should I reapply a repellent?

Rotate repellents every two or three weeks, and reapply after rain. The answer notes that most repellents lose effectiveness when washed off.

Do deer damage tomato leaves or the fruit?

Neither source gives a detailed breakdown of which part of the tomato plant deer prefer. The Ask Extension answer describes tomatoes as highly palatable to deer, but does not separate leaves from fruit.

Sources

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