Posted: 24/04/2017 at 19:09
What sort of seedlings? If they're hardy annuals/perennials they should be fine
The half-hardy ones shouldn't have been sown yet. Mine are still in the packets. I've known snow in June - in Suffolk. Most shrubs will be ok ... some leaves/blooms may get frosted but it's unlikely to kill hardy plants.
If you've got small fruit trees in blossom it might be worthwhile draping them with fleece overnight but otherwise, as Pansyface says, it's not worth getting in a tizz over something we can do nothing about
I've just popped out and put some bubble wrap over the seedlings in the little lean-to greenhouse and now we'll just all cross our fingers together.