Freezing temps this weekend - do I need to worry about my seedlings?

[petitchou]

I've been looking at the forecast and temps may drop to the mid to upper 20's for the next few nights - possibly even a few snow flakes.  This is my first 'real' gardening year and I've got a raised bed full of tiny cool weather seedlings - lettuce, arugula, mache, spinach, radish, turnip, beet, pea and one lone broccoli that just poked it's head up today   I think I saw some leeks and carrots coming up too.  Nothing is over an inch tall - most have just started coming up.  Do I need to cover them?  And what should I use?  It's an 8x12 bed.  Daytime temps should stay in the 40's so they should be okay then - I'm just worried about the nights.

Thanks!

[mattemma04]

I would try to cover them with some plastic.Doing a search for cold frames will give you lots of ideas on how to cover them up.