Jack Frost and onion sets

Wonder if anyone can help. I put in 3 rows of onion sets yesterday as the weather was almost summer like, and forecast similar all week!! hurrah. However i knew the frosts would still come but decided to plant anyway as most of the Site have also put theirs in. I didnt bother with a cloche. The expected frost came with a vengance last night (-3) and i was worried that it may have killed the sets off. Will the sets survive a frost of that degree?

Phew, thats ok then thanks for the reply, however i am certain we will have more frosts this week, inc. tonight. Should i cover them with a cloche?

Thank you so much for the advice, will wait and see what happens. once again thanks

LOL