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Cottonwood Farms - Boulder, CO
Free admission on weekdays this year. The season begins September 21st. They are open every day through Halloween with their pumpkin patch, free corn maze, hayride, farm animals, and produce. Also a great place for Christmas trees from Thanksgiving through Christmas. Their address is 1535 N 75th St., Boulder, CO 80303. It is about 5 miles east of downtown Boulder.
Munson Farms - Boulder, CO
Open seven days a week in season. They have been letting visitors pick their own pumpkins since 1977. Take a hayride around the patch and get lost in their cornstalk maze. Their address is 7568 Valmont Road, Boulder, CO. It is about 6 miles east of Boulder.
Rocky Mountain Pumpkin ranch - Longmont, CO
The farm is open daily for groups (school, church, etc.). Their pumpkin festival for the public runs weekends on Saturday and Sunday with their pumpkin patch and hay maze in October. Also has pony rides, petting zoo, bouncy castle and corn tunnel. Their address is 959 Ute Highway, Longmont, CO 80503. It is about 20 miles north of Boulder.