How often should you feed a corn snake? Hatchlings eat every 2 to 7 days. Juveniles eat about every 7 to 10 days. Adults eat every 1 to 3 weeks, depending on the care guide. Pick prey 1 to 1.5 times as wide as your snake's thickest part. Most corn snakes eat mice, and big adults can take small rats.
That's the quick answer on how often to feed a corn snake. Below, you'll find a schedule table by age and a gram chart for picking the right mouse. You'll also see the signs of feeding too much or too little.
Need live mice in the Tucson area? Mike breeds Hopper, Semi-Adult and Adult mice, plus rats. Call or text Mike: (520) 451-4380.
Corn snake feeding schedule by age
Corn snakes eat less often as they grow. Here's what two trusted sources say. ReptiFiles is a popular care site. PetMD's care sheet is written by a vet, Dr. Maria Zayas.
| Age (length) | ReptiFiles | PetMD |
|---|---|---|
| Hatchling (8 to 20 in) | Every 5 to 7 days | Every other day |
| Juvenile (20 to 45 in) | Every 7 to 10 days | Once a week |
| Subadult (35 to 50 in) | Every 10 to 12 days | Not listed |
| Adult (over 35 in) | Every 14 to 21 days | Every 1 to 2 weeks |
Why the numbers differ. Care guides don't all agree, and that's normal. Both sources agree on the big picture: young snakes eat more often, and adults eat less often. A third source is the Bowling Green State University herpetarium. It feeds its corn snakes once a week, with 1 to 3 food items per meal.
Pick a schedule, then let the scale decide. ReptiFiles suggests weighing your corn snake once a month on a kitchen scale. If an adult keeps gaining, space meals out. ReptiFiles lists every 21 to 35 days for overweight adults and every 10 to 14 days for underweight adults. It adds a warning: don't switch to those schedules without a diagnosis from an experienced reptile vet.
Comparing corn snakes with other species? See how often pet snakes eat.
What does a corn snake eat?
Pet corn snakes eat whole rodents. ReptiFiles says "mice and even small/juvenile rats are the most popular feeders." PetMD lists thawed frozen mice and rats.
In the wild, ReptiFiles says corn snakes eat mice, rats, birds and bats, plus the odd lizard or insect. At home, a whole mouse or small rat is a complete meal.
Skip wild-caught mice. Here's why a mouse from outside is a bad idea.
What size mouse to feed a corn snake?
The width rule comes first. ReptiFiles says to offer prey "between 1-1.5x the width of your snake's body at its widest point." PetMD and the BGSU herpetarium say about the same. Prey should be about as wide as the snake's thickest part.
ReptiFiles also says the total meal should stay near 10% of the snake's body weight, and lower if it's overweight. You can feed two smaller items at once to reach that.
Weigh your corn snake in grams. Then use this chart as a starting point:
| Your corn snake weighs | 10% is about | Mike's size | Price each |
|---|---|---|---|
| 70 to 120 g | 7 to 12 g | Hopper mouse (7 to 12 g) | $1.35 |
| 130 to 170 g | 13 to 17 g | Semi-Adult mouse (13 to 17 g) | $1.55 |
| 180 to 300 g | 18 to 30 g | Adult mouse (18 to 30 g) | $1.80 |
| 300 to 450 g | 30 to 45 g | Two Adult mice, or one Adult plus one smaller mouse | $1.80 each |
| 450 to 850 g | 45 to 85 g | Small rat (45 to 85 g) | $3.00 |
Prices are per animal, plus 6.1% Arizona sales tax. Buy 10 or more and save 10%. At 25 or more, save 20%. At 50 or more, save 30%. Sold as feeders, not pets.
Example. Say your adult corn snake weighs 500 g. Ten percent is 50 g. One Small rat (45 to 85 g) or two Adult mice gets you close. Check the width rule before you pick. If the rat looks wider than 1.5 times your snake's thickest part, go with the two mice.
Hatchlings: Mike's smallest size is the Hopper (7 to 12 g). A brand-new hatchling needs smaller prey, so Mike is a fit once your snake grows into Hoppers.
All sizes are side by side in the feeder size guide.
Signs you're feeding too much or too little
The scale is your best tool. Here's what to watch:
- Steady gain in an adult. If the number keeps rising, space meals out and feed a smaller total meal. ReptiFiles lists every 21 to 35 days for overweight adults, with a vet's diagnosis.
- Weight loss. If your snake keeps losing weight, check its setup and see a reptile vet.
- Big lumps after meals. If the prey is clearly wider than 1.5 times your snake's body, go down a size next time.
- Refusing food. Track it on the scale. A streak of refusals plus weight loss is a reason to see a vet.
Write each weight down with the date. A simple log beats guessing.
Live or frozen mice for corn snakes?
Live or frozen? Your call. Here's the honest picture.
Most corn snakes take frozen-thawed well. ReptiFiles says corn snakes "don't have much of a problem taking frozen/thawed prey." PetMD's vet goes further and advises against live prey for corn snakes. She warns that live rodents "can become aggressive and injure snakes, including causing life-threatening infections."
If your corn snake eats frozen-thawed, keep doing what works. ReptiFiles' routine: thaw the mouse in the fridge a day ahead, then warm it to about 100°F before feeding. PetMD adds: never use a microwave, and never offer a mouse that's still frozen.
Some corn snakes refuse frozen. ReptiFiles says, "If it refuses to eat frozen/thawed, give it live," with close supervision. If you go that way:
- Pick the smallest mouse that fits the width rule.
- Stay and watch the whole time. Never leave a live mouse alone with your snake.
- ReptiFiles says a live rodent "should not be left in your corn snake's enclosure for more than 1 hour." If your snake isn't interested, take it out sooner and try another day.
For the full method, see how to feed live rodents to snakes safely. For the bigger debate, read live vs frozen rats for snakes.
What if my corn snake won't eat?
Work through the basics before you worry:
- [ ] Check your enclosure temperatures against a corn snake care sheet.
- [ ] Check the prey size against the width rule.
- [ ] Warm thawed prey to about 100°F, as ReptiFiles suggests.
- [ ] Try again at the next scheduled meal.
- [ ] If frozen keeps failing, try a live mouse with supervision.
- [ ] Weigh your snake. Steady weight loss means it's time for a reptile vet.
Where can you get live mice near Tucson?
Mike breeds live feeder mice and rats in the Tucson area. Each size lists its weight in grams, so you can match the chart above. No shipping. No dry ice.
Call or text Mike for live mice: (520) 451-4380. Tell him your corn snake's weight and how many you need. He replies the same day. Nothing ready in your size? Get batch alerts, and he'll let you know when the next batch is ready.
Corn snake feeding FAQ
What size mouse for an adult corn snake?
Use the width rule: prey 1 to 1.5 times as wide as your snake's thickest part. By weight, aim for about 10% of the snake's weight. An Adult mouse (18 to 30 g) fits a 180 to 300 g snake. Bigger adults may need two mice or a Small rat.
Can corn snakes eat rats?
Yes. ReptiFiles lists small or juvenile rats among the most popular corn snake feeders. By the 10% rule, a Small rat (45 to 85 g) fits a corn snake of about 450 to 850 g. Check the width rule too.
Is feeding an adult corn snake once a week too much?
It can be. ReptiFiles suggests every 14 to 21 days for adults. PetMD says every 1 to 2 weeks. If your adult keeps gaining weight on a 7-day schedule, space meals out.
What if my corn snake won't eat?
Check temperatures and prey size first. Warm thawed prey to about 100°F. If frozen keeps failing, ReptiFiles suggests trying live with close supervision. If your snake keeps losing weight, see a reptile vet.
Do corn snakes need live mice?
No. Most corn snakes take frozen-thawed mice well. Live mice are a fallback for snakes that refuse frozen. Never leave a live mouse alone with your snake.
How many mice should a corn snake eat at once?
Usually one mouse that fits the width rule. ReptiFiles says two smaller items are fine, as long as the total stays near 10% of the snake's weight.
How often do you feed a baby corn snake?
ReptiFiles says every 5 to 7 days for hatchlings. PetMD says every other day. Either way, use small prey and weigh your snake to track growth.
