When to plant Garlic in Colorado
In spring, from Feb 20 – Mar 20 in Grand Junction to May 15 – June 1 in Steamboat Springs.
In fall: USDA's 1967 table lists garlic as generally spring-planted in every place here. Newer advice from your state's extension service may differ.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring |
|---|---|
| Arvada | Mar 15 – Apr 15 |
| Aurora | Apr 1 – May 1 |
| Berthoud | Apr 1 – May 1 |
| Boulder | Apr 1 – May 1 |
| Brighton | Mar 15 – Apr 15 |
| Broomfield | Mar 15 – Apr 15 |
| Cañon City | Mar 15 – Apr 15 |
| Castle Pines | Apr 1 – May 1 |
| Castle Rock | Apr 1 – May 1 |
| Centennial | Mar 15 – Apr 15 |
| Colorado Springs | Mar 15 – Apr 15 |
| Commerce City | Mar 15 – Apr 15 |
| Denver | Mar 15 – Apr 15 |
| Durango | Apr 15 – May 15 |
| Englewood | Mar 15 – Apr 15 |
| Erie | Apr 1 – May 1 |
| Evans | Mar 15 – Apr 15 |
| Federal Heights | Mar 15 – Apr 15 |
| Firestone | Apr 1 – May 1 |
| Fort Collins | Mar 15 – Apr 15 |
| Fort Morgan | Apr 1 – May 1 |
| Fountain | Mar 15 – Apr 15 |
| Frederick | Apr 1 – May 1 |
| Fruita | Mar 15 – Apr 15 |
| Glenwood Springs | Apr 1 – May 1 |
| Golden | Mar 15 – Apr 15 |
| Grand Junction | Feb 20 – Mar 20 |
| Greeley | Mar 15 – Apr 15 |
| Greenwood Village | Apr 1 – May 1 |
| Johnstown | Apr 1 – May 1 |
| Lafayette | Mar 15 – Apr 15 |
| Lakewood | Mar 15 – Apr 15 |
| Littleton | Mar 15 – Apr 15 |
| Lone Tree | Mar 15 – Apr 15 |
| Longmont | Apr 1 – May 1 |
| Louisville | Apr 1 – May 1 |
| Loveland | Apr 1 – May 1 |
| Montrose | Mar 15 – Apr 15 |
| Monument | Apr 15 – May 15 |
| Northglenn | Mar 15 – Apr 15 |
| Parker | Apr 1 – May 1 |
| Pueblo | Mar 15 – Apr 15 |
| Rifle | Apr 1 – May 1 |
| Severance | Mar 15 – Apr 15 |
| Steamboat Springs | May 15 – June 1 |
| Sterling | Mar 15 – Apr 15 |
| Superior | Apr 1 – May 1 |
| Thornton | Mar 15 – Apr 15 |
| Timnath | Mar 15 – Apr 15 |
| Wellington | Mar 15 – Apr 15 |
| Westminster | Mar 15 – Apr 15 |
| Wheat Ridge | Mar 15 – Apr 15 |
| Windsor | Mar 15 – Apr 15 |
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 garlic.