Jackrabbits are among the least dangerous wild mammals you are likely to encounter. They have no venom, no territorial aggression toward people, and their primary survival strategy is to flee rather than fight. The real risks they pose are indirect: they can carry diseases like tularemia and plague, host ticks that transmit other pathogens, and cause vehicle collisions on rural roads. But even these indirect hazards are uncommon enough that most people who see jackrabbits regularly will never be affected by any of them.
Why Jackrabbits Almost Never Attack
Jackrabbits are hares, not true rabbits, and their entire evolutionary design is built around running away from danger. Black-tailed jackrabbits, the most widespread species in North America, rely on speed and agility to outrun predators rather than hiding or fighting. Research on desert lagomorphs has confirmed this behavioral distinction: while cottontail rabbits depend on concealment and staying hidden in brush to avoid detection, jackrabbits depend on their ability to sprint, reaching speeds of around 35 miles per hour in short bursts and making sharp, evasive zigzag turns.1Ecosphere. Shrub encroachment creates a dynamic landscape of fear for desert lagomorphs via multiple pathways
This means a jackrabbit’s first, second, and third response to a human approaching is to bolt. They do not guard territory, they do not defend nests aggressively the way some ground-nesting birds do, and they have no reason to approach people. A healthy jackrabbit in the wild will almost always run before you get within 20 feet of it. Their powerful hind legs, which make them such effective runners, could theoretically deliver a strong kick if a jackrabbit were cornered or physically restrained, and their claws can scratch. But getting to that point requires you to grab or trap an animal that is desperately trying to leave. This is not a realistic scenario for anyone who is simply hiking, gardening, or living in jackrabbit habitat.
The exception worth knowing about is an injured or sick jackrabbit. An animal that is unable to flee may bite or kick defensively if you try to pick it up. Wildlife rehabilitators recommend using thick gloves and a towel if you must handle one, and calling animal control or a licensed rehabilitator rather than attempting it yourself. A jackrabbit bite can break the skin, and as with any animal bite, infection is a concern. But this is a handling risk, not a threat the animal poses on its own.
Tularemia and Plague
The most substantive health risks jackrabbits pose to humans come from diseases they can carry, and the two most significant are tularemia and plague. Both are bacterial infections that can be transmitted from wild lagomorphs to people, and both can be serious if untreated, though both are also treatable with antibiotics when caught early.
Tularemia, sometimes called “rabbit fever,” is caused by the bacterium Francisella tularensis. It has been diagnosed in multiple species of the genus Lepus (which includes jackrabbits) across North America, and human cases have been linked to contact with infected hares and rabbits.2PubMed Central. Tularemia, plague, yersiniosis, and Tyzzer’s disease in wild rodents and lagomorphs in Canada: a review In the United States, tularemia in humans typically occurs through handling infected carcasses, being bitten by infected ticks or deer flies, or, less commonly, inhaling contaminated dust. Hunters who skin and butcher wild rabbits or hares without gloves face the highest risk. The disease causes fever, skin ulcers at the site of infection, and swollen lymph nodes. It can become life-threatening if it spreads to the lungs or bloodstream, but fatal outcomes are uncommon with modern antibiotic treatment.
Plague, caused by Yersinia pestis, is the same disease responsible for historical pandemics, and it still circulates in wild rodent and lagomorph populations in the western United States. A documented epizootic in California’s Mojave Desert involved both desert cottontail rabbits and black-tailed jackrabbits, and was linked to a human plague case. Researchers described it as the first known plague epizootic involving both species in that region and raised concerns about the broader role of plague in the long-term decline of jackrabbit populations.3PubMed. A Likely Plague Epizootic Involving Wild Lagomorphs in the Mojave Desert of California: Public Health and Ecological Implications Plague in humans is most often transmitted through flea bites, though direct contact with an infected animal’s blood or tissues can also spread it. If you find a dead jackrabbit, the safest course is to leave it alone entirely and report it to local animal control if it is in a populated area.
European brown hares, close relatives of North American jackrabbits, have been identified as reservoirs for several additional zoonotic pathogens, including Brucella suis and the parasite that causes toxoplasmosis.4PubMed Central. European Brown hare (Lepus europaeus) as a source of emerging and re-emerging pathogens of Public Health importance: A review While the specific pathogen profiles differ between species and continents, the general pattern holds: hares and jackrabbits occupy a niche in disease ecology that connects them to several pathogens humans should be aware of, even though transmission events remain uncommon.
How Likely Is a Jackrabbit to Have Rabies?
Rabies is the disease most people worry about when they encounter unfamiliar wildlife, and it is worth addressing directly: rabies in jackrabbits and other lagomorphs is extremely rare. A study of all rabies cases in rodents and lagomorphs reported by U.S. public health agencies from 2011 to 2020 found just 401 confirmed cases across all species tested, out of nearly 22,000 animals, a positivity rate of about 1.8%. The overwhelming majority of those cases were in groundhogs, which accounted for 92% of all rabid rodents and lagomorphs during that period. Eastern cottontail rabbits tested positive in only 8 out of 1,364 animals tested. Jackrabbits did not appear among the frequently reported species.5Journal of Wildlife Diseases. RABIES IN RODENTS AND LAGOMORPHS IN THE USA, 2011–20
An earlier analysis covering 1995 to 2010 reached the same conclusion: rabies remains rare in rodents and lagomorphs as a group, though the researchers noted that transmission from a rabid animal in these species is possible and recommended case-by-case evaluation for anyone who has been bitten or scratched.6PubMed Central. Rabies in rodents and lagomorphs in the United States, 1995–2010 In practical terms, if a jackrabbit bites you, the risk of rabies is very low, but you should still clean the wound thoroughly and contact your doctor. A jackrabbit behaving strangely, approaching humans without fear, staggering, or acting aggressively, could be sick with any number of conditions, and keeping your distance is always the right call.
Ticks and the Diseases They Carry
Jackrabbits host several species of ticks, and those ticks can carry pathogens that matter to human health. A survey at Fort Ord, California found numerous rabbit ticks (Haemaphysalis leporispalustris) on black-tailed jackrabbits. This tick species is known to play a role in maintaining the cycle of Rocky Mountain spotted fever in certain regions.7Journal of Medical Entomology. Survey for the Arthropod Vectors and Mammalian Hosts of Rocky Mountain Spotted Fever and Plague at Fort Ord, California Fleas found on jackrabbits are also relevant, since plague transmission to humans most commonly occurs through flea bites rather than direct contact with the animal itself.
You do not need to physically touch a jackrabbit for its parasites to reach you. If jackrabbits frequent your yard, their fleas and ticks can end up in the grass and latch onto pets or people who walk through the same areas. Dogs that chase or mouth dead jackrabbits are at particular risk, both for tick exposure and for direct contact with pathogens like tularemia. If you live in an area with a visible jackrabbit population, keeping your pets on flea and tick preventatives and checking yourself after spending time outdoors in brushy areas are sensible precautions. These are the same steps recommended for any environment with tick-bearing wildlife, and jackrabbits are one of many species in the chain, not uniquely dangerous in this regard.
Vehicle Collisions
For many people who live in the arid and semi-arid West, the most tangible danger associated with jackrabbits is hitting one with a car. Jackrabbits are crepuscular and nocturnal, meaning they are most active at dawn, dusk, and throughout the night, exactly when visibility on rural roads is lowest. Their tendency to freeze momentarily in headlights before bolting, sometimes directly into the vehicle’s path, has made them a persistent road mortality concern since the early days of automobiles. The naturalist Joseph Grinnell noted jackrabbits among the dead animals he observed on a California highway back in 1920, making them one of the first mammal species documented as road casualties in North America.8Oxford Academic (Journal of Mammalogy). Mammals and roads: Joseph Grinnell’s 1920 observation, modern threats and solutions, and a call to mammalogists for more and better research
A jackrabbit is large for a lagomorph, typically weighing 3 to 6 pounds for a black-tailed jackrabbit and up to 10 pounds for a white-tailed jackrabbit. Hitting one at highway speed is unlikely to cause serious damage to a modern passenger vehicle, but it can startle a driver into swerving, which is where the real danger lies. On two-lane desert highways at night, an abrupt swerve to avoid an animal can send a vehicle off the road or into oncoming traffic. The safest advice, which applies to any small animal in the road, is to maintain your lane and not swerve. This sounds harsh, but the physics of a collision with a 5-pound animal are far less dangerous than losing control of a vehicle.
Garden and Crop Damage
Jackrabbits are herbivores with big appetites, and anyone who has tried to grow vegetables or young ornamental plants in jackrabbit territory knows the frustration. A single jackrabbit can consume about a pound of vegetation per day, and during dry years when wild forage is scarce, they concentrate in irrigated areas like yards, gardens, and agricultural fields. Their populations fluctuate with rainfall and the productivity of wild plants like forbs and grasses, so damage tends to spike in drought years when natural food is limited.9ScienceDirect (Journal of Arid Environments). Plant productivity, predation, and the abundance of black-tailed jackrabbits in the Chihuahuan Desert of Mexico
This is not a safety risk in the bodily-harm sense, but it is the form of “danger” that most often prompts people to search for information about jackrabbits and risk. Jackrabbits can girdle the bark of young trees, devastate vegetable gardens overnight, and damage commercial crops like alfalfa and winter wheat. Fencing is the most effective deterrent, but it needs to be at least two feet high and buried a few inches underground, since jackrabbits will dig under barriers that sit on the surface. Chicken wire with a mesh of one inch or smaller works well. Commercial repellents exist, but most lose effectiveness after rain or irrigation and need frequent reapplication.
People sometimes ask whether jackrabbit droppings in the yard are a health concern. The pellets themselves are dry, fibrous, and generally considered low-risk compared to droppings from carnivores or omnivores. However, any wild animal feces can harbor parasites, and you should wash your hands after gardening in areas where jackrabbits are active, particularly before eating. The droppings do not aerosolize dangerous pathogens the way mouse droppings can with hantavirus; the risk profile is closer to that of deer pellets.
What Makes a Jackrabbit Act Strangely
If you see a jackrabbit sitting still in the open, seemingly unafraid of you, or moving erratically, the animal may be sick or injured. Several diseases can alter jackrabbit behavior in ways that bring them into closer contact with humans than normal. Tularemia can cause lethargy and loss of the flight response. Myxomatosis, a viral disease that affects rabbits and hares, causes swelling around the eyes and head and can leave animals disoriented. Various neurological parasites can also produce abnormal movement patterns.
A jackrabbit that does not flee when you approach within a few feet is not tame or friendly. Wild jackrabbits do not habituate to humans the way squirrels in city parks sometimes do. An animal that tolerates close approach is almost certainly impaired in some way, and you should give it extra distance rather than less. Do not attempt to feed, water, or rescue it. Contact a local wildlife rehabilitation center if the animal appears to be suffering. This is partly for the animal’s sake and partly for yours: a sick jackrabbit is the scenario in which disease transmission risk is highest, because the animal may be shedding higher concentrations of pathogens and may be too weak to flee if you get close enough for its fleas or ticks to reach you.
Pets and Jackrabbits
Dogs are far more likely to have a negative encounter with a jackrabbit than you are. Many dogs will chase jackrabbits instinctively, and while most will never catch one, the chase itself can lead to problems: dogs running into roads, getting lost in unfamiliar terrain, or injuring themselves on fences and brush. Dogs that do catch a jackrabbit risk bites and scratches from the animal’s hind claws, which are strong enough to cause lacerations that may need veterinary attention.
The bigger concern with pets is disease exposure. A dog that mouths or eats a dead jackrabbit can contract tularemia, which causes fever, lethargy, and swollen lymph nodes in dogs and can be serious without treatment. Ticks and fleas from the carcass will readily transfer to your pet and, eventually, to your home. Cats that hunt jackrabbits face similar risks. If your pet has contact with a dead jackrabbit, watch for signs of illness over the following week and consult your veterinarian. Keeping dogs leashed in areas with visible jackrabbit populations reduces most of these risks.
Population Cycles and Why Jackrabbits Seem to Vanish and Reappear
Jackrabbit populations are not stable from year to year. They cycle through periods of abundance and scarcity driven primarily by precipitation and the plant productivity it supports. In the Chihuahuan Desert of Mexico, researchers found that jackrabbit numbers tracked closely with rainfall and the growth of forbs and grasses, and that predation by coyotes had less influence on population size than the food supply did.9ScienceDirect (Journal of Arid Environments). Plant productivity, predation, and the abundance of black-tailed jackrabbits in the Chihuahuan Desert of Mexico This means that after a wet winter, you may see many more jackrabbits in your area than the year before, and after a drought, they may seem to disappear entirely.
These cycles matter for understanding risk because the hazards associated with jackrabbits scale with their density. More jackrabbits in an area mean more ticks and fleas, more droppings, more garden damage, and more vehicle collisions. Disease epizootics like the Mojave Desert plague event are also more likely when populations are dense, because crowding facilitates the spread of pathogens and their flea vectors among animals.3PubMed. A Likely Plague Epizootic Involving Wild Lagomorphs in the Mojave Desert of California: Public Health and Ecological Implications If you notice a sudden increase in jackrabbit sightings, it is worth being a bit more vigilant about tick prevention and keeping pets from investigating carcasses, since the conditions that produce high jackrabbit numbers also produce higher baseline disease risk in the population.
Conversely, a sudden die-off of jackrabbits in your area can itself be a warning sign. Mass mortality events in lagomorphs are sometimes the first visible indicator of plague circulating in the local wildlife. Public health agencies in western states monitor these events as part of plague surveillance. If you find multiple dead jackrabbits in a short time frame, reporting it to your county health department or state wildlife agency helps them track emerging disease activity, and it is a signal to keep your distance and keep pets away from the area until the cause is identified.