Officially, the last day for frost risk is 22 degrees Celsius in Leeds. Not sure if it is the same where I am but since the night time temperatures are predicted to be about 10 degrees over the next few days, I think it’s a reasonable assumption that it’s safe enough for pumpkins which have been hardened off.
That said, there’s no harm in providing a little extra warmth, if the materials are about. So, once I’d got my pumpkins in the ground this morning, I thought the repurposed packaging they had been started off in might as well be popped round one of them. (The other has a repurposed milk carton for cover.)
In the above photo you can also see self-sown lettuce and chard. Then there’s the mangetout I sowed directly in the ground, which are finally coming on, as well as some carrots. So, the ground is already well covered.