What Hardiness Zone Is Arizona?

Q: What hardiness zone is Arizona?

Arizona is in USDA hardiness zones 5b–10a on the 2023 USDA Plant Hardiness Zone Map. Zone 9b is the most common, covering 39% of Arizona's ZIP codes, and zone 10a covers 14%. Enter your ZIP code for your exact zone.

Q: What does zone 9b mean?

Zone 9b means the average annual extreme minimum temperature, the coldest night of a typical winter, is 25°F to 30°F (−4°C to −1°C). Perennials, shrubs and trees rated for zone 9b or colder should survive winter there.

Q: What is the coldest hardiness zone in Arizona?

Zone 5b is the coldest zone mapped in Arizona, found around Bellemont WFO, and zone 10a is the warmest, found around Yuma Quartermaster Depot.

Q: Did Arizona's hardiness zones change in 2023?

The USDA released a new Plant Hardiness Zone Map in November 2023, based on 1991–2020 temperatures instead of 1976–2005. About half of the United States shifted half a zone warmer. Check your ZIP code here, because plant tags and older books may still list your 2012 zone.

Q: When should I plant in zone 9b?

Hardiness zones don't set planting dates; frost dates do. Inside zone 9b in Arizona, the median last spring frost varies from January 4 to February 23. Look up your local frost dates and plant tender crops such as tomatoes after the 10%-risk last-frost date.

USDA 2023 Plant Hardiness Zone Map · 522 ZIP codes · Data updated 2026-10-28

Quick answer

Arizona spans USDA hardiness zones 5b–10a on the 2023 Plant Hardiness Zone Map. The most common zone is 9b, covering 39% of Arizona's ZIP codes, followed by zone 10a (14%). Zone 9b means the coldest night of an average winter reaches 25°F to 30°F (−4°C to −1°C). Enter your ZIP code for your exact zone.

Arizona hardiness zones by share of ZIP codes

Zone 5b<1% · 1 ZIP

Zone 6a1% · 6 ZIPs

Zone 6b5% · 26 ZIPs

Zone 7a8% · 44 ZIPs

Zone 7b3% · 15 ZIPs

Zone 8a6% · 29 ZIPs

Zone 8b11% · 60 ZIPs

Zone 9a13% · 67 ZIPs

Zone 9b39% · 203 ZIPs

Zone 10a14% · 71 ZIPs

What the zones mean for Arizona gardeners

Coldest and warmest towns: among towns with NOAA weather stations, Bellemont WFO (7,152 ft) is in zone 5b, while Yuma Quartermaster Depot (160 ft) is in zone 10a. That is a difference of about 45°F in the coldest night of a typical winter.
Same zone, different frost dates: within zone 9b, the median last spring frost ranges from January 4 at Ehrenberg 2 E to February 23 at Tucson 17 NW, 50 days apart. Your zone tells you which perennials survive winter; your frost dates tell you when to plant.

Typical frost dates in each Arizona zone

Medians across NOAA weather stations in each zone. Colder zones usually have later spring frosts, but local terrain can shift the dates by weeks.

Zone	Last spring frost	First fall frost	Stations
6a	June 5	September 28	3
6b	May 23	October 6	8
7a	May 3	October 17	11
8a	April 18	November 1	9
8b	April 1	November 10	23
9a	February 25	November 29	19
9b	February 3	December 13	22
10a	January 8	December 25	9

Hardiness zones for Arizona cities

Zones at the National Weather Service stations, mostly city airports, with their median frost dates.


Douglas Bisbee Inl Airport	8a	10°F to 15°F	4,105	Apr 11	Nov 2
Elgin 5 S	8a	10°F to 15°F	4,811	Apr 18	Nov 1
Flagstaff Pulliam Airport	6a	−10°F to −5°F	7,003	Jun 4	Sep 28
Fort Huachuca Pioneer Airfield	8b	15°F to 20°F	4,768	Mar 16	Nov 21
Nogales Intl Airport	8b	15°F to 20°F	3,932	Mar 20	Nov 17
Payson	8b	15°F to 20°F	4,850	Apr 29	Oct 24
Phoenix Deer Valley Municipal Airport	10a	30°F to 35°F	1,455	Jan 8	Dec 25
Phoenix Sky Harbor Intl Airport	10a	30°F to 35°F	1,107	Jan 5	Jan 3
Prescott Love Field	8a	10°F to 15°F	5,042	Apr 20	Oct 27
Scottsdale Municipal Airport	10a	30°F to 35°F	1,473	Jan 6	Dec 26
St Johns Industrial Airport	6b	−5°F to 0°F	5,733	May 3	Oct 10
Tucson Intl Airport	9b	25°F to 30°F	2,549	Feb 5	Dec 9
Window Rock Airport	6b	−5°F to 0°F	6,739	May 29	Sep 28
Yuma McAs	10a	30°F to 35°F	213	Rare	Rare

Hardiness zones for 108 towns in Arizona

Each NOAA weather station is shown with the USDA zone of the nearest ZIP code (within 8 miles). Coldest night is the zone's range for the average annual extreme minimum temperature. Click a column to sort.

Filter by town


Aguila	9a	20°F to 25°F	2,165	Mar 17	Nov 19
Alpine	6b	−5°F to 0°F	8,050	Jun 15	Sep 21
Anvil Rch	8b	15°F to 20°F	2,759	Mar 27	Nov 9
Apache Junction 5 NE	9b	25°F to 30°F	2,070	Feb 11	Dec 10
Arizona City	9a	20°F to 25°F	1,525	Feb 28	Nov 21
Bagdad	9a	20°F to 25°F	3,935	Apr 7	Nov 12
Bellemont WFO	5b	−15°F to −10°F	7,152	Jun 21	Sep 17
Benson 6SE	8b	15°F to 20°F	3,690	Apr 12	Nov 1
Betatakin	7a	0°F to 5°F	7,286	May 7	Oct 15
Bisbee 1WNW	8b	15°F to 20°F	5,560	Apr 1	Nov 10
Blue Ridge Ranger Station	7a	0°F to 5°F	6,880	May 31	Oct 2
Bowie	8b	15°F to 20°F	3,777	Apr 1	Nov 6
Bright Angel Ranger Station	6b	−5°F to 0°F	8,000	Jun 3	Sep 27
Bullhead City	10a	30°F to 35°F	531	Jan 4	Dec 23
Carefree	9b	25°F to 30°F	2,530	Feb 4	Dec 16
Casa Grande	9a	20°F to 25°F	1,400	Feb 5	Dec 6
Casa Grande National Monument	9a	20°F to 25°F	1,419	Feb 17	Nov 29
Cascabel	8b	15°F to 20°F	3,194	Apr 24	Oct 31
Castle Hot Springs	9b	25°F to 30°F	1,990	Jan 15	Dec 22
Catalina State Park	9a	20°F to 25°F	2,707	Apr 2	Nov 11
Chandler Heights	9b	25°F to 30°F	1,425	Feb 1	Dec 11
Chino Valley	8a	10°F to 15°F	4,750	Apr 27	Oct 24
Clifton	8b	15°F to 20°F	3,520	Feb 26	Nov 23
Colorado City	7a	0°F to 5°F	5,001	Apr 26	Oct 25
Cordes	8b	15°F to 20°F	3,771	Apr 5	Nov 17
Coronado Nmem	8b	15°F to 20°F	5,242	Apr 7	Nov 9
Douglas	8a	10°F to 15°F	4,040	Mar 18	Nov 13
Douglas Bisbee Inl Airport	8a	10°F to 15°F	4,105	Apr 11	Nov 2
Duncan	8a	10°F to 15°F	3,660	Apr 24	Oct 25
E Mesa	9b	25°F to 30°F	1,518	Feb 1	Dec 10
Ehrenberg 2 E	9b	25°F to 30°F	465	Jan 4	Dec 19
Elgin 5 S	8a	10°F to 15°F	4,811	Apr 18	Nov 1
Flagstaff Pulliam Airport	6a	−10°F to −5°F	7,003	Jun 4	Sep 28
Florence	9a	20°F to 25°F	1,400	Jan 30	Dec 12
Fort Huachuca Pioneer Airfield	8b	15°F to 20°F	4,768	Mar 16	Nov 21
Fort Thomas 2 SW	8b	15°F to 20°F	2,835	Apr 1	Nov 6
Fort Valley	6a	−10°F to −5°F	7,347	Jun 11	Sep 25
Fountain Hills	9b	25°F to 30°F	1,580	Jan 6	Dec 28
Grand Canyon Visitor Center	7a	0°F to 5°F	7,083	May 2	Oct 27
Green Valley	9a	20°F to 25°F	2,900	Feb 25	Nov 27
Greer	6a	−10°F to −5°F	8,275	Jun 5	Sep 29
Heber (black Mesa) Ranger Station	6b	−5°F to 0°F	6,590	May 23	Oct 5
Holbrook	7a	0°F to 5°F	5,085	Apr 22	Oct 24
Jerome	8b	15°F to 20°F	4,950	Mar 26	Nov 25
Keams Canyon	6b	−5°F to 0°F	6,205	May 16	Oct 10
Lake Havasu City	10a	30°F to 35°F	449	Jan 5	Dec 29
Laveen 3 SSE	10a	30°F to 35°F	1,135	Jan 14	Dec 22
Litchfield Park	9b	25°F to 30°F	1,040	Jan 7	Dec 24
Lukachukai	7a	0°F to 5°F	6,520	May 3	Oct 17
Maricopa 4 N	9b	25°F to 30°F	1,160	Feb 23	Nov 24
Mc Nary 2N	6b	−5°F to 0°F	7,340	May 20	Oct 11
Mc Neal	8b	15°F to 20°F	4,170	Apr 6	Nov 10
Meadview 1W	9a	20°F to 25°F	2,938	Mar 5	Nov 28
Miami	9a	20°F to 25°F	3,560	Feb 24	Dec 1
Mount Lemmon Willow Canyon	8b	15°F to 20°F	7,027	Apr 1	Nov 19
Mund's Park	7a	0°F to 5°F	6,470	Jun 10	Sep 27
Natural Brg	8a	10°F to 15°F	4,608	Apr 9	Nov 10
Nogales 6 N	8b	15°F to 20°F	3,461	Apr 16	Nov 2
Nogales Intl Airport	8b	15°F to 20°F	3,932	Mar 20	Nov 17
Oracle State Park	9a	20°F to 25°F	4,595	Mar 29	Nov 13
Organ Pipe Cactus National Monument	9b	25°F to 30°F	1,678	Feb 4	Dec 15
Painted Desert National Park	7a	0°F to 5°F	5,760	May 1	Oct 20
Parker	9b	25°F to 30°F	420	Jan 12	Dec 19
Payson	8b	15°F to 20°F	4,850	Apr 29	Oct 24
Pearce - Sunsites	8b	15°F to 20°F	4,350	Apr 14	Nov 2
Phoenix Deer Valley Municipal Airport	10a	30°F to 35°F	1,455	Jan 8	Dec 25
Phoenix Sky Harbor Intl Airport	10a	30°F to 35°F	1,107	Jan 5	Jan 3
Picacho 8 SE	9a	20°F to 25°F	1,981	Feb 6	Dec 9
Pinetop 2E	6b	−5°F to 0°F	7,200	May 22	Oct 6
Pinnacle Peak	10a	30°F to 35°F	2,565	Jan 27	Dec 21
Pleasant Valley	8a	10°F to 15°F	5,183	May 6	Oct 20
Prescott	7b	5°F to 10°F	5,205	Apr 30	Oct 20
Prescott Love Field	8a	10°F to 15°F	5,042	Apr 20	Oct 27
Punkin Center	9a	20°F to 25°F	2,325	Mar 7	Nov 20
Quartzsite	9a	20°F to 25°F	875	Jan 28	Dec 6
Roosevelt 1 S	9b	25°F to 30°F	2,605	Jan 17	Dec 25
Safford Agricultural Center	8b	15°F to 20°F	2,954	Mar 25	Nov 9
Saguaro National Park	9a	20°F to 25°F	3,080	Jan 26	Dec 16
San Manuel	9a	20°F to 25°F	3,420	Feb 4	Dec 8
Santa Rita Experiment Range	9a	20°F to 25°F	4,300	Feb 25	Dec 5
Scottsdale Municipal Airport	10a	30°F to 35°F	1,473	Jan 6	Dec 26
Sedona	8b	15°F to 20°F	4,220	Apr 1	Nov 17
Show Low Airport	7a	0°F to 5°F	6,411	May 5	Oct 15
Sierra Vista	8b	15°F to 20°F	4,606	Apr 5	Nov 9
Snowflake	7a	0°F to 5°F	5,642	May 11	Oct 10
Sonoita	8a	10°F to 15°F	4,895	Mar 28	Nov 21
South Phoenix	10a	30°F to 35°F	1,155	Jan 21	Dec 16
St Johns Industrial Airport	6b	−5°F to 0°F	5,733	May 3	Oct 10
Stewart Mountain Dam	9b	25°F to 30°F	1,422	Feb 13	Dec 5
Superior	9b	25°F to 30°F	2,860	Jan 18	Dec 28
Tacna 3 NE	9b	25°F to 30°F	324	Feb 13	Dec 1
Tempe Asu	9b	25°F to 30°F	1,167	Feb 13	Dec 5
Tohono Chul	9a	20°F to 25°F	2,527	Feb 26	Dec 4
Tombstone	8b	15°F to 20°F	4,659	Mar 4	Nov 29
Tuba City	7b	5°F to 10°F	4,988	Apr 16	Oct 28
Tucson 17 NW	9b	25°F to 30°F	2,561	Feb 23	Dec 6
Tucson Camp Ave Experiment	9a	20°F to 25°F	2,330	Feb 20	Nov 27
Tucson Intl Airport	9b	25°F to 30°F	2,549	Feb 5	Dec 9
Tucson U Of A #1	9b	25°F to 30°F	2,315	Feb 11	Dec 2
Tucson WFO	9b	25°F to 30°F	2,435	Jan 20	Dec 17
Tumacacori National Monument	8b	15°F to 20°F	3,267	Apr 5	Nov 10
Tuzigoot	8b	15°F to 20°F	3,470	Mar 30	Nov 10
Twin Arrows	7a	0°F to 5°F	5,815	Apr 14	Oct 25
Window Rock Airport	6b	−5°F to 0°F	6,739	May 29	Sep 28
Wittmann 1SE	9b	25°F to 30°F	1,683	Feb 5	Dec 11
Youngtown	9b	25°F to 30°F	1,135	Jan 20	Dec 15
Yuma McAs	10a	30°F to 35°F	213	Rare	Rare
Yuma Quartermaster Depot	10a	30°F to 35°F	160	Jan 8	Dec 28

Frequently asked questions

What hardiness zone is Arizona?

Arizona is in USDA hardiness zones 5b–10a on the 2023 USDA Plant Hardiness Zone Map. Zone 9b is the most common, covering 39% of Arizona's ZIP codes, and zone 10a covers 14%. Enter your ZIP code for your exact zone.

What does zone 9b mean?

Zone 9b means the average annual extreme minimum temperature, the coldest night of a typical winter, is 25°F to 30°F (−4°C to −1°C). Perennials, shrubs and trees rated for zone 9b or colder should survive winter there.

What is the coldest hardiness zone in Arizona?

Zone 5b is the coldest zone mapped in Arizona, found around Bellemont WFO, and zone 10a is the warmest, found around Yuma Quartermaster Depot.

Did Arizona's hardiness zones change in 2023?

The USDA released a new Plant Hardiness Zone Map in November 2023, based on 1991–2020 temperatures instead of 1976–2005. About half of the United States shifted half a zone warmer. Check your ZIP code here, because plant tags and older books may still list your 2012 zone.

When should I plant in zone 9b?

Hardiness zones don't set planting dates; frost dates do. Inside zone 9b in Arizona, the median last spring frost varies from January 4 to February 23. Look up your local frost dates and plant tender crops such as tomatoes after the 10%-risk last-frost date.

Zone and frost dates: use both

Your hardiness zone answers one question: will this plant survive the winter here? Choose perennials, shrubs, trees and bulbs rated for your zone or a colder one. For vegetables and annuals, what matters is the length of the frost-free season. See Arizona frost dates by town, or get a planting calendar for your ZIP code with start-indoors, transplant and sowing dates for 30 crops.

Sources and method

Zones are from the USDA 2023 Plant Hardiness Zone Map ZIP-code files published by the PRISM Climate Group, Oregon State University, based on 1991–2020 minimum temperatures. ZIP codes are assigned to states by USPS prefix. Town zones use the ZIP code nearest each NOAA 1991–2020 Climate Normals station. This is an independent tool, not an official USDA site. Full methodology.