USDA hardiness zones in Arizona
| Zone | Avg. extreme minimum | ZIP codes | Example cities |
|---|---|---|---|
| Zone 5b | −15 to −10°F | 1 | — |
| Zone 6a | −10 to −5°F | 9 | Flagstaff |
| Zone 6b | −5 to 0°F | 19 | — |
| Zone 7a | 0 to 5°F | 34 | Show Low, Winslow, Snowflake |
| Zone 7b | 5 to 10°F | 14 | Prescott Valley, Prescott, Page |
| Zone 8a | 10 to 15°F | 24 | Douglas, Chino Valley |
| Zone 8b | 15 to 20°F | 49 | Sierra Vista, Nogales, Payson, Cottonwood |
| Zone 9a | 20 to 25°F | 61 | Maricopa, Casa Grande, Oro Valley, Sahuarita |
| Zone 9b | 25 to 30°F | 146 | Phoenix, Tucson, Mesa, Gilbert |
| Zone 10a | 30 to 35°F | 45 | Scottsdale, Tempe, Yuma, Lake Havasu City |
Growing zone and frost dates by city
| City | Zone | Frost dates |
|---|---|---|
| Phoenix | 9b (25 to 30°F) | Phoenix frost dates |
| Tucson | 9b (25 to 30°F) | Tucson frost dates |
| Mesa | 9b (25 to 30°F) | Mesa frost dates |
| Gilbert | 9b (25 to 30°F) | Gilbert frost dates |
| Chandler | 9b (25 to 30°F) | Chandler frost dates |
| Glendale | 9b (25 to 30°F) | Glendale frost dates |
| Scottsdale | 10a (30 to 35°F) | Scottsdale frost dates |
| Peoria | 9b (25 to 30°F) | Peoria frost dates |
| Tempe | 10a (30 to 35°F) | Tempe frost dates |
| Surprise | 9b (25 to 30°F) | Surprise frost dates |
| Buckeye | 9b (25 to 30°F) | Buckeye frost dates |
| Goodyear | 9b (25 to 30°F) | Goodyear frost dates |
| Yuma | 10a (30 to 35°F) | Yuma frost dates |
| Avondale | 9b (25 to 30°F) | Avondale frost dates |
| Queen Creek | 9b (25 to 30°F) | Queen Creek frost dates |
| Maricopa | 9a (20 to 25°F) | Maricopa frost dates |
| Flagstaff | 6a (−10 to −5°F) | Flagstaff frost dates |
| Casa Grande | 9a (20 to 25°F) | Casa Grande frost dates |
| Marana | 9b (25 to 30°F) | Marana frost dates |
| Lake Havasu City | 10a (30 to 35°F) | Lake Havasu City frost dates |
| Prescott Valley | 7b (5 to 10°F) | Prescott Valley frost dates |
| Prescott | 7b (5 to 10°F) | Prescott frost dates |
| Oro Valley | 9a (20 to 25°F) | Oro Valley frost dates |
| Apache Junction | 9b (25 to 30°F) | Apache Junction frost dates |
| Sierra Vista | 8b (15 to 20°F) | Sierra Vista frost dates |
| Bullhead City | 10a (30 to 35°F) | Bullhead City frost dates |
| San Luis | 10a (30 to 35°F) | San Luis frost dates |
| Sahuarita | 9a (20 to 25°F) | Sahuarita frost dates |
| Kingman | 9a (20 to 25°F) | Kingman frost dates |
| El Mirage | 9b (25 to 30°F) | El Mirage frost dates |
| Florence | 9a (20 to 25°F) | Florence frost dates |
| Fountain Hills | 9b (25 to 30°F) | Fountain Hills frost dates |
| Eloy | 9a (20 to 25°F) | Eloy frost dates |
| Coolidge | 9a (20 to 25°F) | Coolidge frost dates |
| Nogales | 8b (15 to 20°F) | Nogales frost dates |
| Payson | 8b (15 to 20°F) | Payson frost dates |
| Douglas | 8a (10 to 15°F) | Douglas frost dates |
| Somerton | 10a (30 to 35°F) | Somerton frost dates |
| Chino Valley | 8a (10 to 15°F) | Chino Valley frost dates |
| Cottonwood | 8b (15 to 20°F) | Cottonwood frost dates |
| Camp Verde | 8b (15 to 20°F) | Camp Verde frost dates |
| Show Low | 7a (0 to 5°F) | Show Low frost dates |
| Paradise Valley | 10a (30 to 35°F) | Paradise Valley frost dates |
| Safford | 8b (15 to 20°F) | Safford frost dates |
| Sedona | 8b (15 to 20°F) | Sedona frost dates |
| Tolleson | 9b (25 to 30°F) | Tolleson frost dates |
| Winslow | 7a (0 to 5°F) | Winslow frost dates |
| Wickenburg | 9a (20 to 25°F) | Wickenburg frost dates |
| Globe | 9a (20 to 25°F) | Globe frost dates |
| Page | 7b (5 to 10°F) | Page frost dates |
| Youngtown | 9b (25 to 30°F) | Youngtown frost dates |
| Snowflake | 7a (0 to 5°F) | Snowflake frost dates |
| Litchfield Park | 9b (25 to 30°F) | Litchfield Park frost dates |
| Thatcher | 8b (15 to 20°F) | Thatcher frost dates |
| Benson | 8b (15 to 20°F) | Benson frost dates |
| Cave Creek | 9b (25 to 30°F) | Cave Creek frost dates |
| Guadalupe | 9b (25 to 30°F) | Guadalupe frost dates |
Frequently asked questions
What growing zone is Arizona in?
Arizona’s ZIP codes span USDA zones 5b to 10a, and 9b is the most common. Zones vary with elevation and distance from water, so check your own ZIP code.
When should I plant?
Hardiness zones are about winter cold, not planting dates. For timing, use the last spring frost date for your city on our Arizona frost dates page.