RecoveryHigh hazard · Hemotoxic
Western diamondback rattlesnake
Crotalus atrox
A large, defensive, high-yield pit viper. Hardy in captivity and easy to feed, but the venom yield and strike range make it a two-keeper, shift-box-only animal from the day it arrives.
- Experience level
- Expert only
- Native range
- Southwestern USA, northern Mexico
- Adult size
- 3–5 ft (0.9–1.5 m), occasionally 6 ft
- Lifespan
- 20–25 years
Care sheet
| Adult enclosure | 4 x 2 x 2 ft minimum with a shift box and double locks |
|---|---|
| Basking surface | 90–95°F (32–35°C) |
| Cool side | 75–80°F (24–27°C) |
| Seasonal cool | Winter rest at 55–62°F (13–17°C) |
| Humidity | 35–50%, dry with a humid hide |
| Substrate | 2–3 in aspen or sand-soil blend, kept dry |
| Water | Heavy bowl serviced from outside via tongs or a port |
| UVB | Recommended, 6% across the basking third |
- Strike range is roughly half the body length — the room, not just the enclosure, needs that clearance.
- Dry husbandry prevents the scale rot and blister disease this species is prone to; wet substrate is the most common husbandry killer.
- Rattles wear out. A quiet animal is not a calm animal, so never use rattling as your only warning cue.
Safety & bite protocol
- Never open an enclosure alone. Two trained keepers, hooks in hand, escape route clear, door to the room closed.
- Shift the snake into a locked transfer box for every clean; do not work around a loose high-hazard viper.
- Written protocol on the wall: call 911, keep the limb below heart level, no tourniquet, no ice, no cutting, transport to the confirmed antivenom hospital, notify them en route with the species name.
- Confirm CroFab stock and vial count with your nearest emergency department each year and log the call.
- Keep permits, caging inspection reports and liability insurance current in the venomous portal — expiry alerts exist for a reason.
Husbandry information only — not medical or legal advice. Permit rules, caging standards and antivenom availability differ by state, county and city.
Feeding
- Adults: one appropriately sized rat every 14–21 days; this species obesities easily in captivity.
- Frozen-thawed on long tongs through a shifted door; never hand-place food.
- Fasting through the cool season is normal — record the intended fast so it does not read as a refusal streak.
Breeding tips
- Season
- Brumate November–February, pair spring
- Gestation / incubation
- Live-bearing, 5–7 month gestation
- Clutch / litter
- 4–20 neonates
- Breeding a high-hazard species is a permit, insurance and placement question before it is a husbandry one — know where every neonate goes first.
- Brumate 3 months at 55–62°F (13–17°C) with water; males need the rest to produce viable sperm.
- Pair under two-keeper conditions and separate after each observed lock.
- Gravid females need a stable 84–88°F basking option and total quiet; do not shift them unnecessarily in the last month.
- Prepare labelled, individually locked neonate housing and update your permit inventory the day the litter is born.
Neonates
- Neonates are venomous, fast and defensive from birth — treat each tub as a hot enclosure.
- One per locked tub, 85°F warm end, first feed after the neonatal shed at 7–14 days.
- Only transfer to permitted keepers, with a signed record of the transfer in the animal's file.
FAQ
What insurance do venomous keepers need?
Most permit systems ask for liability cover naming venomous reptiles specifically; standard home contents policies exclude them. Store the policy document and renewal date in the venomous portal so it never lapses quietly.
Can a rattlesnake be kept in a rack?
Purpose-built hot racks exist, but they must have locking, tong-serviceable fronts and a shift system. Standard tub racks are not appropriate for high-hazard species.
Keep the paperwork with the animal
Permits, liability insurance, vet records and apprenticeship hours all live in the venomous portal, with expiry alerts before anything lapses.