When to plant in Gilbert, AZ
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in Gilbert, Arizona — is derived from the closest NOAA station with complete climate normals.
A generous ~313-day season lets Gilbert gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. Zone 9b is warm enough that Gilbert can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
CHANDLER HEIGHTS · 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 Gilbert’s own odds, recorded at CHANDLER HEIGHTS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 11 | Feb 21 | Jan 29 | Nov 12 | Nov 28 | Dec 14 |
| 32°F | Feb 27 | Feb 1 | Jan 2 | Nov 23 | Dec 11 | Jan 1 |
| 28°F | Feb 11 | Jan 8 | Dec 15 | Dec 4 | Dec 26 | Jan 29 |
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 Gilbert, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Gilbert planting FAQ
When is the last spring frost in Gilbert, AZ?
On average, the last spring frost in Gilbert is around February 1 (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 Gilbert, AZ?
In Gilbert, the first 32°F freeze of fall lands around December 11 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Gilbert in?
Gilbert is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Gilbert?
There are roughly 313 frost-free days in Gilbert (a long growing season), running from the average last frost around February 1 to the first fall frost near December 11.
When should I plant tomatoes in Gilbert?
In Gilbert, start tomato seeds indoors around December 7–December 21, then transplant seedlings outdoors around February 8 once the danger of frost has passed.
Never miss a window in Gilbert
An email when it’s time to start seeds, transplant, and sow — timed to Gilbert’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Mesa · 10 km
- Chandler · 11 km
- Queen Creek · 14 km
- Sun Lakes · 16 km
- Tempe · 20 km
- Apache Junction · 20 km
- San Tan Valley · 22 km
- Gold Canyon · 30 km
Frost dates recorded at CHANDLER HEIGHTS, 13 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 Gilbert, AZ — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00021514. Retrieved from https://blissgarden.com/arizona/gilbert.