When to plant Radishes in Idaho
In spring, from Mar 1 – May 1 in Lewiston to Apr 15 – June 15 in Garden City.
In fall, from June 1 – Aug 15 in Rexburg to Aug 15 – Oct 15 in Lewiston.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Ammon | Apr 1 – June 1 | July 1 – Sept 1 |
| Blackfoot | Mar 20 – May 10 | July 1 – Sept 1 |
| Boise City | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Burley | Apr 1 – June 1 | July 1 – Sept 1 |
| Caldwell | Mar 20 – May 10 | July 15 – Sept 15 |
| Chubbuck | Apr 15 – June 15 | July 1 – Sept 1 |
| Coeur d'Alene | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Eagle | Mar 20 – May 10 | Aug 1 – Oct 1 |
| Garden City | Apr 15 – June 15 | July 15 – Sept 15 |
| Hayden | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Idaho Falls | Apr 1 – June 1 | July 1 – Sept 1 |
| Jerome | Mar 20 – May 10 | July 15 – Sept 15 |
| Kuna | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Lewiston | Mar 1 – May 1 | Aug 15 – Oct 15 |
| Meridian | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Middleton | Mar 20 – May 10 | July 15 – Sept 15 |
| Moscow | Mar 20 – May 10 | July 1 – Sept 1 |
| Mountain Home | Mar 20 – May 10 | July 15 – Sept 15 |
| Nampa | Mar 20 – May 10 | July 15 – Sept 15 |
| Pocatello | Mar 20 – May 10 | July 15 – Sept 15 |
| Post Falls | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Rathdrum | Mar 10 – May 10 | Aug 1 – Oct 1 |
| Rexburg | Apr 1 – June 1 | June 1 – Aug 15 |
| Sandpoint | Apr 1 – June 1 | July 1 – Sept 1 |
| Star | Mar 20 – May 10 | July 15 – Sept 15 |
| Twin Falls | Mar 20 – May 10 | July 15 – Sept 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 radishes.