I think that soil temperature matters a lot for early spring snow peas and snap peas.
I think it's a lot like gambling and playing the stock market: only you know how pain-averse you are, and how much pleasure you get from each win.
Do you consider losing one crop in three a good investment if it gets you multiple crops two weeks earlier? Maybe not.
How about losing one crop in ten? Sure.
One in five? That's individual. If you sow succession crops every two weeks, you might be very willing to lose a few. If you're vigorous and have a lot of hoops and sheets and blankets and plastic film, you might take late frost as a challenge that you know you can beat.
If you expect to sow all your early crops in one weekend, and all your warm crops in one other weekend, and can afford to wait for your first fresh salads, losing even one crop in ten might be too much.
Or, if you're a weekend gardener, it might come down to "THIS weekend it isn't raining, so wish me luck!" (If the long-range forecast is smiling)
If you start seeds indoors, you either need a big cold frame or a willingness to gamble ... or patience.
