When to plant in Mesa, AZ
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in Mesa, Arizona — is derived from the closest NOAA station with complete climate normals.
With about 312 frost-free days, Mesa supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. In zone 9b, frost is a minor factor for Mesa — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
E MESA · 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 Mesa’s own odds, recorded at E MESA.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 15 | Feb 27 | Jan 31 | Nov 13 | Nov 30 | Dec 15 |
| 32°F | Feb 28 | Feb 1 | Jan 1 | Nov 22 | Dec 10 | Jan 1 |
| 28°F | Feb 11 | Jan 11 | Dec 13 | Dec 1 | Dec 26 | Jan 28 |
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 Mesa, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Mesa planting FAQ
When is the last spring frost in Mesa, AZ?
Plan for the last spring frost in Mesa around February 1 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Mesa, AZ?
The first fall frost in Mesa typically arrives around December 10 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Mesa in?
Mesa is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Mesa?
Mesa has about 312 frost-free days — a long growing season — between the average last spring frost (February 1) and first fall frost (December 10).
When should I plant tomatoes in Mesa?
For Mesa, sow tomatoes indoors about December 7–December 21 and move the seedlings out around February 8, after the last spring frost.
Never miss a window in Mesa
An email when it’s time to start seeds, transplant, and sow — timed to Mesa’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Gilbert · 10 km
- Apache Junction · 16 km
- Chandler · 18 km
- Tempe · 20 km
- Queen Creek · 20 km
- Fountain Hills · 23 km
- Sun Lakes · 25 km
- Gold Canyon · 27 km
Frost dates recorded at E MESA, 7 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 Mesa, AZ — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00022782. Retrieved from https://blissgarden.com/arizona/mesa.