I also plant out in April. Prior to that I cover the beds with black plastic, to warm up the soil.
I plant out when soil temperature is 50F+to 57 (=10C- 14C). Our early April air temperature is in 40F-60F range ( = 4.5C to 15.5C). So there is no frost but it will take a long time for the weather to warm up like the middle of May. That is when traditionally people around here plant out tomatoes.
Gardeneer
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