Like with many things, there is no ONE answer. Then to qualify your question with only ambient heat. It makes it impossible to answer.

I have had snakes feed all thru forced hibernation, 55F approx. They digest small prey items slowly, but completely. Large prey items, cannot be digested and are reguriged.

To ask about "Toxic" would mean, somehow you stop the snake from throwing up. As normally that is what they would do.

As an example, last year I found a hog on 12-31 last day of the year, it was 33F when I found it, the night time temps were mid twenties and it had a large lizard bolus in it. It digested that bolus just fine.

Hydration is the real problem, A dehydrated snake can have real problems, particularly when temps are not sufficient.

Lastly, why would you not have heat available? you know a hot spot. If your not going to support digestion, then don't feed it.

Hopefully no one responded to your question because they would not feed a cold snake with no ability to find heat(alternate heat source).

I hope someone else responds to your question. Best wishes

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