How long will it take for pumpkins to grow if seed is planted in August?
Certified GKH Gardening Expert
They generally take about 3-4 months of nice, sunny weather to grow so you're looking at October/November harvesting.
If your seeds come in a package it should say how many days on it till estimated harvest. getting real close to late for halloween.
Good luck. If your in a hot zone like me, you may not have much luck this year.