I don't worry about 40-50F night time lows, as long as the days have lots of sun and temperatures in the high 60's and 70's. I wouldn't get anything planted until after mid-June, if I did. I already have a short season, so that's not an option.
As long as the daylight hours have good sunny growing weather, I don't think a few colder nights have any permanent effect. Now, if the days are cold and cloudy as well for an extended period, that's different.
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Dee
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