When to plant Tomatoes in Colorado
In spring, from Apr 20 – June 1 in Grand Junction to June 15 – 30 in Steamboat Springs.
In fall, from June 1 – 20 in Arvada to June 10 – 20 in Steamboat Springs.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Arvada | May 10 – June 15 | June 1 – 20 |
| Aurora | May 15 – June 10 | June 1 – 20 |
| Berthoud | May 15 – June 10 | June 1 – 20 |
| Boulder | May 15 – June 10 | June 1 – 20 |
| Brighton | May 10 – June 15 | June 1 – 20 |
| Broomfield | May 10 – June 15 | June 1 – 20 |
| Cañon City | May 10 – June 15 | June 1 – 20 |
| Castle Pines | May 15 – June 10 | June 1 – 20 |
| Castle Rock | May 15 – June 10 | June 1 – 20 |
| Centennial | May 10 – June 15 | June 1 – 20 |
| Colorado Springs | May 10 – June 15 | June 1 – 20 |
| Commerce City | May 10 – June 15 | June 1 – 20 |
| Denver | May 10 – June 15 | June 1 – 20 |
| Durango | May 25 – June 15 | June 1 – 20 |
| Englewood | May 10 – June 15 | June 1 – 20 |
| Erie | May 15 – June 10 | June 1 – 20 |
| Evans | May 10 – June 15 | June 1 – 20 |
| Federal Heights | May 10 – June 15 | June 1 – 20 |
| Firestone | May 15 – June 10 | June 1 – 20 |
| Fort Collins | May 10 – June 15 | June 1 – 20 |
| Fort Morgan | May 15 – June 10 | June 1 – 20 |
| Fountain | May 10 – June 15 | June 1 – 20 |
| Frederick | May 15 – June 10 | June 1 – 20 |
| Fruita | May 10 – June 15 | June 1 – 20 |
| Glenwood Springs | May 15 – June 10 | June 1 – 20 |
| Golden | May 10 – June 15 | June 1 – 20 |
| Grand Junction | Apr 20 – June 1 | June 1 – July 1 |
| Greeley | May 10 – June 15 | June 1 – 20 |
| Greenwood Village | May 15 – June 10 | June 1 – 20 |
| Johnstown | May 15 – June 10 | June 1 – 20 |
| Lafayette | May 10 – June 15 | June 1 – 20 |
| Lakewood | May 10 – June 15 | June 1 – 20 |
| Littleton | May 10 – June 15 | June 1 – 20 |
| Lone Tree | May 10 – June 15 | June 1 – 20 |
| Longmont | May 15 – June 10 | June 1 – 20 |
| Louisville | May 15 – June 10 | June 1 – 20 |
| Loveland | May 15 – June 10 | June 1 – 20 |
| Montrose | May 10 – June 15 | June 1 – 20 |
| Monument | May 25 – June 15 | June 1 – 20 |
| Northglenn | May 10 – June 15 | June 1 – 20 |
| Parker | May 15 – June 10 | June 1 – 20 |
| Pueblo | May 10 – June 15 | June 1 – 20 |
| Rifle | May 15 – June 10 | June 1 – 20 |
| Severance | May 10 – June 15 | June 1 – 20 |
| Steamboat Springs | June 15 – 30 | June 10 – 20 |
| Sterling | May 10 – June 15 | June 1 – 20 |
| Superior | May 15 – June 10 | June 1 – 20 |
| Thornton | May 10 – June 15 | June 1 – 20 |
| Timnath | May 10 – June 15 | June 1 – 20 |
| Wellington | May 10 – June 15 | June 1 – 20 |
| Westminster | May 10 – June 15 | June 1 – 20 |
| Wheat Ridge | May 10 – June 15 | June 1 – 20 |
| Windsor | May 10 – June 15 | June 1 – 20 |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for tomatoes.