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Colorado: Vegetable Planting Calendar

Montana Zone Hardiness Map

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.

Colorado Last & First Frost Dates
CityLast Frost DateFirst Frost Date
Aspen6/308/19
Boulder5/179/20
Denver5/209/20
Ft. Collins
5/189/17
Holly5/139/22
Lamar5/119/28
Montrose5/259/21
Norwood6/268/23
Silverton7/258/3
Walden6/118/6
*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. 
 
Shop Our Vegetable Seeds

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