Colorado: Vegetable Planting Calendar

Planting vegetable seeds or transplants at the correct time is important for getting the most out of your garden. Knowing your first and last frost dates will help you start your vegetable seeds at the right time.
Colorado is in USDA plant hardiness zones 3-7.
 Learning Download: Growing in Colorado
Colorado Last & First Frost Dates
City Last Frost Date First Frost Date
Aspen 6/30 8/19
Boulder 5/17 9/20
Denver 5/20 9/20
Ft. Collins 5/18 9/17
Holly 5/13 9/22
Lamar 5/11 9/28
Montrose 5/25 9/21
Norwood 6/26 8/23
Silverton 7/25 8/3
Walden 6/11 8/6

*Based on statistics there is a 10% chance that frost will occur before or after these dates. Watch your local weather for more accurate dates.

Colorado on average has approximately 120 days between the last and first frost. Follow the planting schedules below for when to plant tomatoes, peppers and other vegetables.

Zone 3 Planting Schedule
Zone 3 Colorado Planting Schedule
Zone 4 Planting Schedule
Zone 4 Colorado Planting Schedule
Zone 5 Planting Schedule
Zone 5 Colorado Planting Schedule
Zone 6 Planting Schedule
 Zone 6 Colorado Garden Schedule
Zone 7 Planting Schedule

Zone 7 Colorado Garden Schedule