When to plant in Anthem, AZ
USDA Zone 9bAnthem, Arizona frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
With about 351 frost-free days, Anthem supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. These dates come from a station roughly 18 km away, the closest with full normals; terrain around Anthem (elevation, water, pavement) can move your real frost dates a few days either way. Zone 9b is warm enough that Anthem can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
PHOENIX DEER VALLEY MUNI AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Anthem’s own odds, recorded at PHOENIX DEER VALLEY MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 2 | Feb 1 | Jan 1 | Nov 25 | Dec 11 | Dec 29 |
| 32°F | Feb 12 | Jan 8 | Dec 16 | Dec 5 | Dec 25 | Jan 23 |
| 28°F | Feb 2 | Jan 8 | Dec 15 | Dec 14 | Jan 7 | Feb 1 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in Anthem, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Anthem planting FAQ
When is the last spring frost in Anthem, AZ?
On average, the last spring frost in Anthem is around January 8 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Anthem, AZ?
In Anthem, the first 32°F freeze of fall lands around December 25 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Anthem in?
Anthem is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Anthem?
There are roughly 351 frost-free days in Anthem (a long growing season), running from the average last frost around January 8 to the first fall frost near December 25.
When should I plant tomatoes in Anthem?
In Anthem, start tomato seeds indoors around November 13–November 27, then transplant seedlings outdoors around January 15 once the danger of frost has passed.
Never miss a window in Anthem
An email when it’s time to start seeds, transplant, and sow — timed to Anthem’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- New River · 5 km
- Peoria · 18 km
- Sun City West · 29 km
- Sun City · 29 km
- Scottsdale · 30 km
- Phoenix · 31 km
- El Mirage · 34 km
- Glendale · 35 km
Frost dates recorded at PHOENIX DEER VALLEY MUNI AP, 18 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Anthem, AZ — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003184. Retrieved from https://blissgarden.com/arizona/anthem.