When to plant Swiss chard in Arizona
In spring, from Jan 1 – Apr 1 in El Mirage to May 20 – June 1 in Flagstaff.
In fall, June 1 – Dec 1.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Apache Junction | Jan 10 – Apr 1 | June 1 – Dec 1Now |
| Avondale | — | June 1 – Dec 31Now |
| Buckeye | — | June 1 – Dec 31Now |
| Bullhead City | — | June 1 – Dec 31Now |
| Camp Verde | Apr 1 – June 15 | June 1 – Sept 10 |
| Casa Grande | Jan 10 – Apr 1 | June 1 – Dec 1Now |
| Chandler | Jan 10 – Apr 1 | June 1 – Nov 1Now |
| Chino Valley | Apr 15 – June 15 | June 1 – Aug 1 |
| Coolidge | Jan 20 – Apr 15 | June 1 – Nov 1Now |
| Cottonwood | Mar 1 – May 25 | June 1 – Sept 15 |
| Douglas | Feb 20 – May 15 | June 1 – Sept 15 |
| El Mirage | Jan 1 – Apr 1 | June 1 – Dec 1Now |
| Eloy | Feb 1 – May 1 | June 1 – Nov 1Now |
| Flagstaff | May 20 – June 1 | June 1 – July 5 |
| Florence | Jan 1 – Apr 1 | June 1 – Dec 1Now |
| Fountain Hills | — | June 1 – Dec 31Now |
| Gilbert | Jan 1 – Apr 1 | June 1 – Dec 1Now |
| Glendale | Jan 1 – Apr 1 | June 1 – Dec 1Now |
| Goodyear | — | June 1 – Dec 31Now |
| Kingman | Mar 1 – May 25 | June 1 – Sept 15 |
| Lake Havasu City | — | June 1 – Dec 31Now |
| Marana | Mar 1 – May 25 | June 1 – Sept 15 |
| Maricopa | Jan 20 – Apr 15 | June 1 – Oct 1 |
| Mesa | Jan 1 – Apr 1 | June 1 – Dec 1Now |
| Nogales | Feb 20 – May 15 | June 1 – Oct 1 |
| Oro Valley | Mar 1 – May 25 | June 1 – Sept 15 |
| Paradise Valley | — | June 1 – Dec 31Now |
| Payson | Apr 15 – June 15 | June 1 – Aug 1 |
| Peoria | Jan 10 – Apr 1 | June 1 – Dec 1Now |
| Phoenix | — | June 1 – Dec 31Now |
| Prescott | Apr 15 – June 15 | June 1 – Aug 1 |
| Prescott Valley | Apr 15 – June 15 | June 1 – Aug 1 |
| Queen Creek | Jan 1 – Apr 1 | June 1 – Dec 1Now |
| Safford | Feb 20 – May 15 | June 1 – Sept 15 |
| Sahuarita | Feb 1 – May 1 | June 1 – Nov 1Now |
| San Luis | — | June 1 – Dec 31Now |
| Scottsdale | Jan 1 – Apr 1 | June 1 – Dec 31Now |
| Show Low | Apr 15 – June 15 | June 1 – July 20 |
| Sierra Vista | Mar 15 – June 15 | June 1 – Sept 15 |
| Somerton | — | June 1 – Dec 31Now |
| Surprise | Jan 10 – Apr 1 | June 1 – Dec 1Now |
| Tempe | Jan 10 – Apr 1 | June 1 – Nov 1Now |
| Tucson | Jan 10 – Apr 1 | June 1 – Dec 1Now |
| Yuma | — | June 1 – Dec 31Now |
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 swiss chard.