Grow with confidence
Colorado Vegetable Planting Calendar
Plan your garden around Colorado's varied elevations, frost dates, and USDA growing zones.
USDA Zones 3–7Elevation creates major local differences
About 120 DaysAverage statewide frost-free season
2023 USDA MapUpdated official hardiness-zone data
Plan around local weather
Colorado First & Last Frost Dates
Use the nearest city as a starting point, then adjust for your elevation, microclimate, and current forecast.
| City | Last Spring Frost | First Fall Frost |
|---|---|---|
| Aspen | June 30 | August 19 |
| Boulder | May 17 | September 20 |
| Denver | May 20 | September 20 |
| Fort Collins | May 18 | September 17 |
| Holly | May 13 | September 22 |
| Lamar | May 11 | September 28 |
| Montrose | May 25 | September 21 |
| Norwood | June 26 | August 23 |
| Silverton | July 25 | August 3 |
| Walden | June 11 | August 6 |
Historical dates are estimates. There is approximately a 10% chance frost may occur before or after the dates shown.
No chart images or zooming
Choose Your Planting Zone
Select a zone to view its month-by-month planting and harvest windows. The schedule is built in HTML so it remains readable on every screen.
Zone 5 Planting Schedule
Start indoorsPlant/transplantHarvest
Swipe the calendar horizontally to see later months.
