When to plant Summer squash (zucchini) in Arizona
In spring, from Feb 1 – Apr 15 in El Mirage to June 1 – 20 in Flagstaff.
In fall, June 1 – Sept 15.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Apache Junction | Feb 15 – Apr 15 | June 1 – Sept 15 |
| Avondale | — | June 1 – Oct 1 |
| Buckeye | — | June 1 – Oct 1 |
| Bullhead City | — | June 1 – Oct 1 |
| Camp Verde | May 1 – June 15 | June 1 – Aug 1 |
| Casa Grande | Feb 15 – Apr 15 | June 1 – Sept 15 |
| Chandler | Feb 15 – Apr 15 | June 1 – Sept 1 |
| Chino Valley | May 1 – 30 | June 1 – July 20 |
| Coolidge | Mar 1 – Apr 15 | June 1 – Sept 1 |
| Cottonwood | Apr 10 – June 1 | June 1 – Aug 10 |
| Douglas | Apr 1 – May 15 | June 1 – Aug 10 |
| El Mirage | Feb 1 – Apr 15 | June 1 – Sept 15 |
| Eloy | Mar 15 – May 15 | June 1 – Sept 1 |
| Flagstaff | June 1 – 20 | June 1 – July 1 |
| Florence | Feb 1 – Apr 15 | June 1 – Sept 15 |
| Fountain Hills | — | June 1 – Oct 1 |
| Gilbert | Feb 1 – Apr 15 | June 1 – Sept 15 |
| Glendale | Feb 1 – Apr 15 | June 1 – Sept 15 |
| Goodyear | — | June 1 – Oct 1 |
| Kingman | Apr 10 – June 1 | June 1 – Aug 10 |
| Lake Havasu City | — | June 1 – Oct 1 |
| Marana | Apr 10 – June 1 | June 1 – Aug 10 |
| Maricopa | Mar 1 – Apr 15 | June 1 – Aug 20 |
| Mesa | Feb 1 – Apr 15 | June 1 – Sept 15 |
| Nogales | Apr 1 – May 15 | June 1 – Aug 20 |
| Oro Valley | Apr 10 – June 1 | June 1 – Aug 10 |
| Paradise Valley | — | June 1 – Oct 1 |
| Payson | May 1 – 30 | June 1 – July 20 |
| Peoria | Feb 15 – Apr 15 | June 1 – Sept 15 |
| Phoenix | — | June 1 – Oct 1 |
| Prescott | May 1 – 30 | June 1 – July 20 |
| Prescott Valley | May 1 – 30 | June 1 – July 20 |
| Queen Creek | Feb 1 – Apr 15 | June 1 – Sept 15 |
| Safford | Apr 1 – May 15 | June 1 – Aug 10 |
| Sahuarita | Mar 15 – May 15 | June 1 – Sept 1 |
| San Luis | — | June 1 – Oct 1 |
| Scottsdale | Feb 1 – Apr 15 | June 1 – Oct 1 |
| Show Low | May 1 – 30 | June 1 – July 15 |
| Sierra Vista | Apr 20 – June 1 | June 1 – Aug 10 |
| Somerton | — | June 1 – Oct 1 |
| Surprise | Feb 15 – Apr 15 | June 1 – Sept 15 |
| Tempe | Feb 15 – Apr 15 | June 1 – Sept 1 |
| Tucson | Feb 15 – Apr 15 | June 1 – Sept 15 |
| Yuma | — | June 1 – Oct 1 |
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 summer squash.