Species · Beginner snake
Rubber Boa
Charina bottae
A tiny, cool-climate boa that feels like living rubber — one of the calmest, most cold-tolerant snakes there is.
Difficulty: Beginner Printable care sheet →
The rubber boa is a small, slow-moving, unbelievably gentle snake that feels exactly like its name — smooth, soft, and rubbery. It is a cool-climate native from the Pacific Northwest, so it breaks the reptile rulebook: no basking bulb, no tropical humidity, no UVB drama. If you want a snake that almost never bites, tolerates handling calmly, and thrives at ordinary room temperatures, this little burrower is hard to beat — just source it responsibly.
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Care at a glance
| Adult size | Roughly 15–28 in (38–84 cm); most adults sit around 21–26 in. Southern populations run smaller. A slender, small-bodied snake. |
|---|---|
| Lifespan | Commonly 15–25+ years in captivity, with a verified longevity record of about 26.5 years (higher figures are cited but unverified). Either way a long-lived, slow-growing species — plan for a multi-decade commitment. |
| Enclosure | Adult minimum a 20-gallon long (approx. 30 x 12 in floor space); a 40-gallon breeder is better. Floor space matters far more than height — this is a terrestrial burrower, not a climber. |
| Basking / warm zone | Warm end roughly 78–85°F (26–29°C) as the ceiling — never let the warm side exceed 85°F. No basking bulb or hot spot is needed; gentle background warmth from a low under-tank heater on a thermostat is plenty. |
| Cool side | Cool end around 65–72°F (18–22°C). Rubber boas are genuinely cool-tolerant and are active at temperatures far lower than most snakes. |
| Night | A natural night drop is fine and welcome — into the low-to-mid 60s°F (around 60–68°F / 16–20°C). No supplemental night heat required in a normal room. |
| UVB & lighting | Not required. As a nocturnal/crepuscular burrower it does well on a simple 12-hour ambient light cycle with no UVB. A very low-output UVB bulb won't hurt if you want to follow modern best practice, but it is genuinely optional for this species. |
| Humidity | Low to moderate, roughly 40–60%. A light morning misting plus a damp-moss humid hide covers shedding and hydration — do not saturate the substrate or run misters. |
| Substrate | A burrowable, moisture-holding substrate: aspen shavings, coconut fiber/coir, or a soil-based bioactive mix a few inches deep so it can tunnel. Avoid cedar and pine (aromatic oils are harmful) and avoid dusty sand. |
| Diet | Appropriately sized frozen-thawed rodents — pinky to small adult mice depending on the snake's girth. Feed roughly every 1–2 weeks (juveniles more often, adults less). In the wild they specialize in nestling rodents, but captive-bred mice fully meet their needs. |
| Supplements | A whole-prey rodent diet is nutritionally complete, so routine dusting is not needed. A light dusting of calcium is only a consideration for animals that never get any UVB and eat a very restricted diet — for most rubber boas on whole rodents it is unnecessary. |
What it's like to live with a Rubber Boa
House one snake per enclosure. Rubber boas are solitary outside of breeding; co-housing risks stress, competition at feeding, and injury, and offers the animals no benefit.
Your first month together
The settling-in period, in order — so you know what's normal and when not to worry.
- Set up and stabilize the enclosure BEFORE the snake arrives: confirm a thermal gradient with a warm side capped at 85°F and a cool side in the 60s, verified with a digital probe thermometer (not stick-on dials).
- Provide at least two snug hides — one on the warm end, one on the cool end — plus a damp-moss humid hide for shedding.
- Give a few inches of burrowable substrate; this species spends much of its time hidden and underground, so don't panic when you rarely see it.
- Keep a sturdy, always-full water bowl — rubber boas dehydrate easily.
- Leave the new snake alone to settle for about a week before the first feeding, and wait until it's eating reliably before regular handling.
- Offer the first meal as a frozen-thawed rodent in the evening; if refused, wait several days and try again rather than force the issue.
Through the year, and as they grow
Rubber boas naturally brumate (a cool dormancy) through winter and may stop eating in late summer/autumn as a cue. A controlled brumation around 50–60°F for a couple of months is optional for pets but is normal biology; if you brumate, stop feeding first so the gut is empty, then cool gradually and rewarm gradually. If you don't brumate, simply let winter temperatures dip naturally.
The pet store gets these wrong
Common myths, kindly corrected — no shame for having believed them.
- "All snakes need a hot basking spot and UVB." Not this one. Rubber boas are cool-climate specialists — a warm side above 85°F is dangerous, and a body temperature in the low 90s°F can be fatal. Room temperature is closer to ideal than a desert setup.
- "It's a good easy first snake to buy at any expo." The care is easy, but rubber boas are rarely captive-bred and are often wild-caught. Wild collection harms slow-reproducing local populations and many are protected — source an ethical, established animal, and check your local laws.
- "The tail is a real second head it uses to fool predators." It's true they coil into a ball, hide the head, and wave the blunt tail as a decoy — hence the "two-headed snake" nickname — but the classic story is often overstated. Field observations suggest much of the famous tail scarring actually comes from mother rodents biting the boa while it raids their nests, not from predator attacks.
Before you buy
- Sourcing is the hard part: captive-bred rubber boas are uncommon and pricey, and many on the market are wild-caught. Insist on a legal, ethically produced animal — never buy a wild-collected one.
- Check legality. Rubber boas are native and in places protected or regulated; some regions restrict keeping or collecting them.
- This is a 20–30+ year commitment in a small, quiet package — great for patient keepers, less rewarding if you want an active display snake.
- It's a burrower that hides most of the time and eats infrequently, so accept that you'll often just see substrate.
- You'll need a cool room. If your home runs hot year-round, this species is a poor fit.
💷 The rubber boa itself is usually the cheapest part — see the real cost of keeping one (upfront + ongoing, no sales pitch).
See a reptile vet if…
We can't diagnose from afar — but these are the signs to stop watching and get a professional:
- See an exotics/reptile vet if the snake refuses food for an unusually long stretch beyond a normal seasonal fast, especially with visible weight or muscle loss along the spine.
- Retained shed, particularly stuck eye caps or tail tip — recurring bad sheds point to a hydration or humidity problem worth a checkup.
- Open-mouth breathing, wheezing, bubbling from the nose or mouth, or excess mucus — possible respiratory infection.
- Persistent tiny mites, unusual lumps or swellings, mouth redness/discharge, or any wound.
- Regurgitation of a meal, prolonged lethargy, or a body temperature exposure event where the animal got too hot — overheating is a genuine emergency for this heat-sensitive species.
Heading in? Print the free Rubber Boa vet-prep sheet — what to bring, what to tell the vet, and the questions to ask.
Never
- Never let the warm side exceed 85°F or expose it to a hot basking lamp — overheating can kill this cool-climate snake.
- Never use cedar or pine shavings; the aromatic oils are harmful to snakes.
- Never feed wild-caught rodents (parasite and toxin risk) — use captive-bred frozen-thawed prey.
- Never buy a wild-collected rubber boa — it harms fragile local populations and may be illegal.
- Never co-house multiple rubber boas outside supervised breeding.
- Never keep it in a bone-dry, hideless tank — it needs burrowable substrate, hides, and a humid retreat for healthy sheds.
Common rubber boa questions
How hard are Rubber Boas to keep — are they good for beginners?
Beginner. One of the calmest, most cold-forgiving snakes you can keep — it wants a cool room, not a heat lamp, which flips the usual reptile setup on its head. The catch is availability: they are almost never captive-bred, so sourcing an ethical, established animal is the real hurdle, not the daily care.
What do Rubber Boas eat?
Appropriately sized frozen-thawed rodents — pinky to small adult mice depending on the snake's girth. Feed roughly every 1–2 weeks (juveniles more often, adults less). In the wild they specialize in nestling rodents, but captive-bred mice fully meet their needs.
How big an enclosure do Rubber Boas need?
Adult minimum a 20-gallon long (approx. 30 x 12 in floor space); a 40-gallon breeder is better. Floor space matters far more than height — this is a terrestrial burrower, not a climber.
What basking temperature do Rubber Boas need?
Warm end roughly 78–85°F (26–29°C) as the ceiling — never let the warm side exceed 85°F. No basking bulb or hot spot is needed; gentle background warmth from a low under-tank heater on a thermostat is plenty.
What should the cool side be for Rubber Boas?
Cool end around 65–72°F (18–22°C). Rubber boas are genuinely cool-tolerant and are active at temperatures far lower than most snakes.
What night-time temperature do Rubber Boas need?
A natural night drop is fine and welcome — into the low-to-mid 60s°F (around 60–68°F / 16–20°C). No supplemental night heat required in a normal room.
What UVB and lighting do Rubber Boas need?
Not required. As a nocturnal/crepuscular burrower it does well on a simple 12-hour ambient light cycle with no UVB. A very low-output UVB bulb won't hurt if you want to follow modern best practice, but it is genuinely optional for this species.
What humidity do Rubber Boas need?
Low to moderate, roughly 40–60%. A light morning misting plus a damp-moss humid hide covers shedding and hydration — do not saturate the substrate or run misters.
What substrate do Rubber Boas need?
A burrowable, moisture-holding substrate: aspen shavings, coconut fiber/coir, or a soil-based bioactive mix a few inches deep so it can tunnel. Avoid cedar and pine (aromatic oils are harmful) and avoid dusty sand.
What supplements do Rubber Boas need?
A whole-prey rodent diet is nutritionally complete, so routine dusting is not needed. A light dusting of calcium is only a consideration for animals that never get any UVB and eat a very restricted diet — for most rubber boas on whole rodents it is unnecessary.
How big do Rubber Boas get?
Roughly 15–28 in (38–84 cm); most adults sit around 21–26 in. Southern populations run smaller. A slender, small-bodied snake.
How long do Rubber Boas live?
Commonly 15–25+ years in captivity, with a verified longevity record of about 26.5 years (higher figures are cited but unverified). Either way a long-lived, slow-growing species — plan for a multi-decade commitment.
What are the signs Rubber Boas are sick or need a vet?
See a reptile or exotics vet if you notice: See an exotics/reptile vet if the snake refuses food for an unusually long stretch beyond a normal seasonal fast, especially with visible weight or muscle loss along the spine.; Retained shed, particularly stuck eye caps or tail tip — recurring bad sheds point to a hydration or humidity problem worth a checkup.; Open-mouth breathing, wheezing, bubbling from the nose or mouth, or excess mucus — possible respiratory infection.; Persistent tiny mites, unusual lumps or swellings, mouth redness/discharge, or any wound.; Regurgitation of a meal, prolonged lethargy, or a body temperature exposure event where the animal got too hot — overheating is a genuine emergency for this heat-sensitive species..
Your first two weeks · Taming & handling · Behaviours explained · Won't eat? · Stuck shed · When to see a vet
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This guide was written and fact-checked against these authorities. It's kind, general guidance — not a diagnosis or a substitute for an exotics vet:
- Animal Diversity Web — Charina bottae — Family, size (35–84 cm), captive lifespan, diet, cool active temperature (~14°C), habitat and burrowing biology.
- Reptiles Magazine — Rubber Boa Care Tips — Warm end capped at 85°F, cool end ~65°F, low-90s°F body temp can be fatal, no hot spot needed, 20-gal minimum, mouse diet, brumation at 55°F.
- Reptile.Guide — Rubber Boa Care Sheet — Adult 40-gal enclosure, warm 75–85°F / cool 65–70°F, no UVB requirement, humidity 50–60%, substrate, feeding frequency, dehydration risk.
- Nevada Department of Wildlife — Northern Rubber Boa — Size 12–28 in, diet, moist/cool habitat, nocturnal/crepuscular, docile temperament, musk defense, live-bearing, 7–30 yr lifespan.
- RubberBoas.com — Natural History of the Rubber Boa — Heat intolerance, seek-cool behavior, nestling-mammal diet, docile/never-strike temperament, tail 'false head' myth nuance (mother-mouse bites), semi-fossorial.
- AnAge / Human Ageing Genomic Resources — Charina bottae — Recorded maximum longevity 26.5 years in captivity.
Written and fact-checked by The Baskden Team against veterinarian-authored sources — if your reptile shows a red-flag sign above, see an exotics vet promptly.