Yes! Ash from fire pits can be used in compost to help fertilize gardens. Sprinkling a bit of ash in the compost will add nutrients such as calcium. This is especially useful if you have a tomato garden, as tomatoes thrive in calcium-rich soils.
You can also use fire pit ashes to de-ice driveways and walkways as a replacement for salt. And, if you’d rather not make a watery mess putting out your next fire, save the ashes from the previous fire to smolder new flames.