Last frost?

It was cloudy and there was a cold wind in London for most of yesterday, that is to say Saturday. Some rain. While this morning in Epsom it is still, bright and clear. And at 0620, a sharp frost on our extension and garage roofs, still in the shade of the rest of the house. Will it be the last frost of the winter? Unlikely to be the first car booter of the summer, at least not for us.