Easy to get cvarried away in a mild Spring
The Cherry blossom (and other Spring blossom) has been like I can never remember it this year.
But my advice is to do some-and-some. I'm feeling a bit of a twit for not planting some things early this year ...
Maybe 2-in-3 years you will get away with it, and if so its worth a punt, so long as you have backups. I tend not to plant out anything until 1st June, which is the opposite extreme.
This year I planted 10 of the fastest maturing First Early spuds a fortnight earlier than the rest. I doubt we can eat 10 plant's worth of harvest in a fortnight, so hopefully I've got the balance right. I put 10 Pink Fir Apple in too, because they are rarely ready before the end of August and I like to have some for Bar-B-Q lunches. But perhaps I should do a batch of early Courgettes, Runners, Sweetcorn etc early.
I also think growing one or two Tomatoes for the greenhouse in January, and putting them under lights if need be, would be worth doing too. I grow 15 greenhouse tomato plants in total, and I could never house them indoors if started early, but just a couple would be fine, and even if they were leggy the others would be there to carry the main crop.
My Winter Squash take all Summer to make any fruit, which I then store for the winter, so I don't see any gain starting them early.
But I ain't going to start the whole lot early, as I have done in previous years, and then spent hours and hours trying to keep the frost off them faffing about with fleece, grass clippings and all sorts, to only have stalled plants that then sulked and took ages to get going again ...
But maybe I'm just too cautious