I generally don't try to harden my tomatoes when the temp is in the 30s - 36 degrees at 5 feet can be freezing temps on the ground or in low pockets.
Today it is in the 40s currently. No wind, so three feet inside the garage its 55 and the angle of the sun is low enough that the seedlings get some sun-hardening. Definitely makes them greener and thicker!
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