When to plant in Flowing Wells, AZ
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in Flowing Wells, Arizona — is derived from the closest NOAA station with complete climate normals.
With about 294 frost-free days, Flowing Wells 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 Flowing Wells — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Flowing Wells is now 10 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
TUCSON U OF A #1 · 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 Flowing Wells’s own odds, recorded at TUCSON U OF A #1.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 30 | Mar 6 | Feb 12 | Nov 4 | Nov 22 | Dec 6 |
| 32°F | Mar 7 | Feb 11 | Jan 16 | Nov 16 | Dec 2 | Dec 20 |
| 28°F | Feb 17 | Jan 18 | Dec 21 | Nov 29 | Dec 15 | Jan 17 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Flowing Wells, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 6 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.
Flowing Wells planting FAQ
When is the last spring frost in Flowing Wells, AZ?
Plan for the last spring frost in Flowing Wells around February 11 (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 Flowing Wells, AZ?
In Flowing Wells, the first 32°F freeze of fall lands around December 2 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Flowing Wells in?
Flowing Wells is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Flowing Wells?
Flowing Wells has about 294 frost-free days — a long growing season — between the average last spring frost (February 11) and first fall frost (December 2).
When should I plant tomatoes in Flowing Wells?
For Flowing Wells, sow tomatoes indoors about December 17–December 31 and move the seedlings out around February 18, after the last spring frost.
Never miss a window in Flowing Wells
An email when it’s time to start seeds, transplant, and sow — timed to Flowing Wells’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Casas Adobes · 5 km
- Tucson Mountains · 6 km
- Catalina Foothills · 12 km
- Oro Valley · 14 km
- Tucson Estates · 17 km
- Drexel Heights · 17 km
- Valencia West · 20 km
- Tucson · 20 km
Frost dates recorded at TUCSON U OF A #1, 4 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 Flowing Wells, AZ — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00028817. Retrieved from https://blissgarden.com/arizona/flowing-wells.