You typically want to dig up your dahlia tubers after the foliage has died back following a frost and before a hard freeze. With that being said, depending on the severity of the freeze your tubers might be okay. You should dig them up as soon as possible and inspect the tubers. If your tubers froze, they will need to be replaced. If the ground did not yet freeze to the level they were planted there is a chance they will be okay. If the tubers appear okay, store them for the winter in preparation for planting in the spring. There is still the chance the hard freeze killed the tubers, but you will not know until next year’s growing season.
Hi Kim,
You typically want to dig up your dahlia tubers after the foliage has died back following a frost and before a hard freeze. With that being said, depending on the severity of the freeze your tubers might be okay. You should dig them up as soon as possible and inspect the tubers. If your tubers froze, they will need to be replaced. If the ground did not yet freeze to the level they were planted there is a chance they will be okay. If the tubers appear okay, store them for the winter in preparation for planting in the spring. There is still the chance the hard freeze killed the tubers, but you will not know until next year’s growing season.