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Some pumpkins just ripenSome pumpkins just ripen faster than others and it could be related to their location on the vine, how much sun they're getting, and other factors. Unless frost is coming, just let those immature pumpkins ripen on the vine; cut any leaves back to give them plenty of the remaining sunlight.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?