I start putting my plants out to harden off when it's well into the 50s. I stick them under the table on the deck so they are mostly out of direct sun and then, after a few days, put them on top of the table.
They have been taking daily trips outside and then back into the unheated sunporch at night since the temperatures are dropping into the upper 40s. The forecast here (zone 6, Cleveland) is calling for 50's overnight towards the end of the week so the plan is to keep them out.
I'm still a week or two from getting anything into the ground so I'm not in any hurry.
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