How fast are rattlesnakes? On the ground, rattlesnakes are slow: the fastest lab burst on record, by a sidewinder, was 3.7 km/h (2.3 mph). Their strike, however, is very fast. A 2016 study clocked western diamondbacks at about 2.95 m/s (6.6 mph), and each strike lasted only about 71 milliseconds.
Convert Rattlesnake Speeds to mph, km/h and ft/s
Type any speed from this page into the converter. For example, enter 2.95 for the diamondback strike or 1.03 for the sidewinder burst (3.7 km/h). The tool uses the exact definitions of the foot (0.3048 m) and the mile (1.609344 km).
So the honest answer has two halves. Rattlesnakes crawl slower than you walk, yet they strike faster than you can blink. As a result, mixing up those two numbers is the reason so many pages online disagree.
For example, some sites say rattlesnakes “move at 2 to 3 miles per hour,” while others claim a strike of 5.5 meters per second. However, neither figure comes from a measurement we could find. Instead, this guide uses two peer-reviewed studies. The first, Penning, Sawvel and Moon (2016) in Biology Letters, filmed strikes at 250 frames per second. The second, a 1992 study in the Journal of Experimental Biology, timed sidewinder rattlesnakes on a treadmill and a track.
Next, you will find both sets of numbers in US and metric units. After that, the guide covers strike distance, the effect of temperature, and how to stay safe. If you want speeds for all snakes rather than rattlers only, see our broader guide to how fast snakes are.
How Fast Rattlesnakes Strike: The Lab Numbers
In the 2016 study, researchers filmed 12 western diamondback rattlesnakes (Crotalus atrox) at 27 degrees C (81 degrees F). In addition, they filmed cottonmouths and harmless Texas rat snakes for comparison. Below, the table shows the average results, converted with the exact unit definitions.
| Snake | Peak strike speed | Peak acceleration | Strike distance | Strike duration |
|---|---|---|---|---|
| Western diamondback (12 snakes) | 2.95 m/s (6.6 mph, 10.6 km/h) | 169 m/s² (about 17 g) | 12.7 cm (5.0 in) | 71 ms |
| Western cottonmouth (6 snakes) | 2.98 m/s (6.7 mph, 10.7 km/h) | 173 m/s² | 13.6 cm (5.4 in) | 66 ms |
| Texas rat snake (14 snakes) | 2.67 m/s (6.0 mph, 9.6 km/h) | 190 m/s² (about 19 g) | 16.7 cm (6.6 in) | 74 ms |
In short, a diamondback strike covers about 5 inches in roughly 0.07 seconds. Also, the authors note that snake strikes reach their targets in about 50 to 90 ms. For comparison, they cite a human blink of about 202 ms, so the strike is close to three times faster than a blink.
The surprise, however, was the rat snake. In fact, it accelerated harder than either viper. As a result, the study overturned the old idea that rattlesnakes and other vipers have the fastest strikes of all snakes.
How Fast Rattlesnakes Crawl on the Ground
By contrast, crawling speed is far less impressive. In the 1992 sidewinder study, the fastest burst from any snake was 3.7 km/h (2.3 mph), and bursts ranged from 0.5 to 3.7 km/h. Meanwhile, the highest speed the snakes could sustain aerobically was only about 0.6 km/h (0.37 mph).
| Claim or measurement | km/h | mph | m/s | Verdict |
|---|---|---|---|---|
| Sidewinder, sustainable pace | 0.6 | 0.37 | 0.17 | Measured (1992 study) |
| Sidewinder, fastest burst | 3.7 | 2.30 | 1.03 | Measured (1992 study) |
| Popular claim “2 to 3 mph” | 3.2 to 4.8 | 2 to 3 | 0.89 to 1.34 | At or above the measured burst |
| Popular claim “3 to 5 km/h” | 3 to 5 | 1.9 to 3.1 | 0.83 to 1.39 | Upper end not supported |
| Old claim “strike at 8 ft per second” | 8.78 | 5.45 | 2.44 | Too low for the lab average |
| Old claim “strike at 5.5 m/s” | 19.8 | 12.3 | 5.5 | Not found in any study |
Therefore, treat “2 to 3 mph” as a generous upper limit for a short dash, not a normal pace. Most of the time, in fact, rattlesnakes sit still and wait for prey. A brisk human walk of about 3 mph is already faster than the best sidewinder burst on record. For sprint figures, see how fast a human can run.
Crawl Speed vs Strike Speed vs Reaction Time
Four different numbers get mixed up when people talk about how fast rattlesnakes are. Because each one measures something else, the table separates them.
| Term | What it measures | Typical rattlesnake value |
|---|---|---|
| Crawl speed | How fast the whole body travels over ground | Up to about 3.7 km/h (2.3 mph) in a burst |
| Strike speed | Peak speed of the head during a strike | About 2.8 to 4.1 m/s (6.3 to 9.1 mph) |
| Strike acceleration | How quickly the head gains speed | About 169 m/s² in diamondbacks |
| Strike duration | Time from launch to contact | About 70 ms |
For example, an acceleration of 169 m/s² equals about 17 times the pull of gravity. That figure, therefore, is why headlines compare snake strikes with fighter jets. Even so, the head only reaches a few meters per second, because the strike ends after a few inches.
How Far Can Rattlesnakes Strike?
In the lab, diamondbacks struck about 12.7 cm (5 inches) on average. Park agencies, meanwhile, give a body-length rule instead. Yosemite National Park says rattlesnakes can strike only half their own length. Other parks, however, use a more cautious two-thirds rule and suggest at least 6 feet (1.8 m) of space.
| Snake length | Half its length | Two-thirds of its length |
|---|---|---|
| 2 ft (0.61 m) | 1 ft (0.30 m) | 1.33 ft (0.41 m) |
| 3 ft (0.91 m) | 1.5 ft (0.46 m) | 2 ft (0.61 m) |
| 4 ft (1.22 m) | 2 ft (0.61 m) | 2.67 ft (0.81 m) |
| 5 ft (1.52 m) | 2.5 ft (0.76 m) | 3.33 ft (1.02 m) |
| 6 ft (1.83 m) | 3 ft (0.91 m) | 4 ft (1.22 m) |
As a result, even a very large snake cannot reach 6 feet. Still, you rarely know a hidden snake’s length, so keep a wide margin.
Why Warm Rattlesnakes Strike Faster
Because rattlesnakes are cold-blooded, their muscles work faster when they are warm. A 2020 study in the Journal of Experimental Biology tested defensive strikes from western and Mohave rattlesnakes at 15 to 35 degrees C (59 to 95 degrees F). In that study, strike speed rose with temperature.
- Western rattlesnakes: for example, about 3.23 m/s at 15 degrees C, rising to about 4.06 m/s (9.1 mph) at 35 degrees C.
- Mohave rattlesnakes: similarly, about 2.80 m/s at 15 degrees C, rising to about 3.78 m/s (8.5 mph) at 35 degrees C.
- Strike distance: averages ranged from about 14 to 24 cm (5.6 to 9.4 in), depending on species and temperature.
Notably, the cool snakes still struck fast. In other words, a snake on a chilly morning is slower, but it is not harmless.
Recommended Tools for Keeping Your Distance From Rattlesnakes
A laser rangefinder tells you exactly how far away a snake, a rock pile or a trail marker is, so you can watch from a safe spot. In addition, snake gaiters cover the lower legs, where most bites on hikers land. Choose gaiters that state the material and coverage clearly, and wear them with boots and long pants.
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Rattlesnakes vs Other Snakes and Reptiles
Overall, compared with other snakes, rattlesnakes are average crawlers and good, though not record-setting, strikers. Similarly, many reptiles share the same pattern: slow most of the time, fast for a moment.
| Animal | Fast movement | Source |
|---|---|---|
| Western diamondback rattlesnake | Strike about 2.95 m/s (6.6 mph) | Penning et al. 2016 |
| Sidewinder rattlesnake | Crawl burst up to 3.7 km/h (2.3 mph) | 1992 JEB study |
| Texas rat snake (harmless) | Strike about 2.67 m/s, with higher acceleration | Penning et al. 2016 |
| American alligator | Land dash about 9 to 11 mph | See our alligator guide |
For the fastest snakes on the ground, such as mambas and racers, see our snake speed guide. Likewise, for a reptile that can actually dash, read how fast an alligator is.
How to Time a Snake’s Speed From a Safe Distance
In general, you can estimate how fast any animal moves with distance and time alone. Here is a careful method that keeps you well back:
- Stay at least 6 feet away. Better still, stand much farther back and, instead of moving closer, use a zoom lens.
- Pick two fixed markers. For example, choose two rocks or sticks that the snake will pass.
- Measure the gap. For instance, a laser rangefinder can read each marker’s distance from where you stand.
- Film at a known frame rate. Then record; slow-motion video at 120 or 240 frames per second works well.
- Count the frames. Next, divide the frame count by the frame rate to get the time in seconds.
- Divide distance by time. For example, 1 m in 2 s is 0.5 m/s; enter it in the converter above to get 1.8 km/h or 1.12 mph.
Rattlesnake Safety: Do and Don’t
The CDC estimates that 7,000 to 8,000 people in the US are bitten by venomous snakes each year, and about 5 die. Its first-aid guidance replaces some older advice, such as keeping the bite below the heart. Instead, it says to rest with the bite in a neutral, comfortable position.
Do
- Wear boots and long pants on trails and in brush.
- Also, watch where you put your hands and feet.
- Back away slowly and give the snake room to leave.
- Call 911 at once if someone is bitten, because time matters.
- Then keep calm, remove rings and wash the bite gently.
Don’t
- Pick up or poke a snake, even a dead one.
- Use a tourniquet, ice or electric shock.
- Similarly, never cut the wound or try to suck out venom.
- Drink alcohol for the pain, since it does not help.
- Finally, never wait for symptoms before getting help.
Honest Limits of These Speed Numbers
First, every value here is an average from a small group of captive snakes. Second, lab strikes aim at a target, such as a glove or balloon, so wild strikes on prey may differ. Third, only sidewinders have a published crawl-speed test that we could find, so other species may be a little faster or slower. Finally, temperature, size and the surface all change the result. In short, read the figures as good estimates, not fixed limits.
When Accuracy Really Matters
For trivia, “about 3 m/s and 70 ms” is accurate enough. For safety, however, exact speed matters far less than distance. Since no one can react to a 70 ms strike, the only real defense is staying out of range in the first place.
FAQs About How Fast Rattlesnakes Move
How fast are rattlesnakes on the ground?
For example, the fastest measured burst, by a sidewinder, was 3.7 km/h (2.3 mph). However, their sustainable pace was only about 0.6 km/h (0.37 mph).
How fast do rattlesnakes strike?
Western diamondbacks averaged about 2.95 m/s (6.6 mph) in a 2016 study. Also, a 2020 study recorded about 4 m/s for western rattlesnakes at 35 degrees C.
How long does a rattlesnake strike take?
About 71 milliseconds on average for diamondbacks. In other words, that is roughly three times faster than a 202 ms human blink.
Can you outrun rattlesnakes?
Yes, easily, since a brisk walk is faster than their best crawl. In fact, the danger is the strike, not a chase.
How far can a rattlesnake strike?
Yosemite says about half its body length, while some parks use two-thirds. So keep at least 6 feet (1.8 m) away.
Do rattlesnakes chase people?
No. Instead, they usually stay still or move away, because they see people as predators rather than prey.
Are rattlesnakes the fastest striking snakes?
No. In the 2016 study, harmless rat snakes accelerated harder, while cottonmouths matched the diamondbacks.
Do rattlesnakes strike faster when it is hot?
Yes. In the 2020 study, strike speed rose steadily from 15 to 35 degrees C. Even so, cool snakes still struck quickly.
What is 2.95 m/s in mph?
In other words, 2.95 m/s equals about 6.60 mph, 10.62 km/h or 9.68 feet per second.
What should I do if a rattlesnake bites someone?
First, call 911 right away. Then keep the person calm and still, remove rings, and skip tourniquets, ice and cutting.
Bottom Line on How Fast Rattlesnakes Are
To sum up, rattlesnakes are slow on the ground, topping out near 2.3 mph in a short burst. Their strike, by contrast, reaches about 3 to 4 m/s and lands in roughly 70 ms.
So respect the strike, not the chase. Give every rattlesnake at least 6 feet of space, and use the converter above to turn any snake speed into units you can picture.