hard frost

If we climb up into a hard frost, we're dead men.

We'll have a few insects, perhaps, until first hard frost.

Flowering never stops from May to the first hard frost.

Lesson number one, don't open the windows when there's a hard frost, he told himself.

The next day there was a harder frost than before.

With a hard frost, the plant will die down to the ground and grow back the following spring.

The best time to cover them is after the first hard frost.

Leave the best until after a hard frost, when they sweeten up.

"We let the whole top get hit by hard frost," he added.

Nor hard frost, either, we're on the edge of it.