My guess is that high 60s would slow the metabolism enough endure 90 days or so of "off-feed" but may not satisfy the snakes instinct to seek a cooler location and so it might remain active which of course burns calories. It might also never "feel" brumated and so turn back on to feeding.

BUT, I'll bet that, if you put it in the coolest spot (with some water) and it doesn't beat itself up trying to get out, eventually it will turn back on. As I've shown you, they can go for long periods off-feed and be fine. In the case of my Honduran Milk, 176 days and with a little weight loss but he's just fine now and eating well!
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See all my snakes at SerpenTrack.com

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