You don't say where you are so I'm assuming you are in the UK, in which case it is too early to put courgettes in a cold frame. Although it is warmer and sunnier now than it was a couple of days ago, if the sky is clear at night frost is likely.
I don't put my courgettes outside (even in a cold frame) much before June.
I don't put my courgettes outside (even in a cold frame) much before June.
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