Some seeds need cold to germinate and just get going when the time is right.
You could cover some up with fleece, net curtain or plastic bottles if you’re concerned.
Pinterest has ideas for home made cloches.
Gransnet forums
Gardening
Due to the nice weather i have a small corner in my veg patch which has warmed up beautifully, so i have sown three rows of spring onions and two of beetroots. I have lettuce, tomato and runner beans all in the green house. Toms and lettuce in a tray with cover as GH not heated. Just hope i havent set my self up to fail if the weather changes. 
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