Following a few of your comments about peas, I thought I'd follow it up with a bit of research. I've always known peas can tolerate frosts and freezes, in fact the year before last we had frost on June 3rd (!!), so most of our garden goes in either in cold frames or polytunnels if we want it planted before June. But I was unsure how how low the temps could get with the peas still surviving.
This is a very interesting read!
AS LOW AS 10 DEGREES IF COVERED BY SNOW!! WOW!!