On Jan 30, 8:40*pm, "Zen83237" wrote:
ok it stopped raining long enough on Thursday for me to pour the concrete
for the footings of a greenhouse. ok no rain but of course now frost. It is
covered with timber and a tarpaulin but when is it safe to take the cover
off?

Kevin

After 24hrs or as long as you like after 24hrs. The longer the better.