Sure, it happens every year to some of us, we discuss it each year too...it's rare to lose all of a flat though because there will be seeds in there that haven't germinated yet. So depsite having some seedlings die, don't chuck a flat until at least the middle of May or later because there are usually ungerminated seeds still in the soil.

....as Trudi said. Most of the seeds are smarter and wait LOL!
Most of losses were my own fault this year because I got impatient and sowed some things too early..had a warm March and cold/freezing April...like: Cypress Vine, Tithonia, Tomato, and Gomphrena. Next time I wait until at least 5th of May when I start stuff like Pumpkin and Melon :D

Vera

I lost some zinnias and marigolds last spring. But we had that dreadful freeze in April!! I just replanted and they roared right up.

Shellva, after awhile you amass so many seeds you can get where you're almost thankful that nature takes a few out for you.

Kim, who can't possibly imagine feeling that way...LOL...

I've lost my share...but what I do is I get out the tarps. When the weatherman talks snow or hard freezes and I have seedligns,I cover the containers in one fell swoop. Sometimes, depending, I just let them tough it out. There are usually seeds in the container that still haven't germinated...and sometimes the cold gets to a seedling, but it doesn't die.
Basil is usually what I lose. Happens every year. Then, I just resow. Zinnia seedlings seem to be super sensitive here...I always make sure to cover those if it's going to get real cold. But I always hold some seed back, just in case.

L

I have lost very few seedlings to frost and like the others I resow as needed. It helps to keep some seeds held back. I find that usually I have such great germination that I have way too many seedlings so there is no problem with sowing fewer the first time.

My seedlings have to tough it out as with over 500 containers last spring there was no way I wanted to bring them into the garage or cover them.

Bobbie