When to plant in Marana, AZ
USDA Zone 9bMarana, Arizona frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
These dates come from a station roughly 20 km away, the closest with full normals; terrain around Marana (elevation, water, pavement) can move your real frost dates a few days either way. Zone 9b is warm enough that Marana can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
CATALINA SP · 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 Marana’s own odds, recorded at CATALINA SP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 18 | Apr 4 | Oct 18 | Nov 1 | Nov 17 |
| 32°F | Apr 18 | Apr 2 | Mar 16 | Oct 26 | Nov 11 | Nov 29 |
| 28°F | Apr 1 | Mar 12 | Feb 22 | Nov 3 | Nov 21 | Dec 10 |
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 Marana, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
Marana planting FAQ
When is the last spring frost in Marana, AZ?
On average, the last spring frost in Marana is around April 2 (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 Marana, AZ?
The first fall frost in Marana typically arrives around November 11 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Marana in?
Marana is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Marana?
There are roughly 223 frost-free days in Marana (a long growing season), running from the average last frost around April 2 to the first fall frost near November 11.
When should I plant tomatoes in Marana?
In Marana, start tomato seeds indoors around February 5–February 19, then transplant seedlings outdoors around April 9 once the danger of frost has passed.
Never miss a window in Marana
An email when it’s time to start seeds, transplant, and sow — timed to Marana’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Oro Valley · 16 km
- Casas Adobes · 18 km
- Tucson Mountains · 21 km
- Flowing Wells · 22 km
- Saddlebrooke · 26 km
- Catalina Foothills · 30 km
- Tucson Estates · 32 km
- Drexel Heights · 37 km
Frost dates recorded at CATALINA SP, 20 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 Marana, AZ — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00021357. Retrieved from https://blissgarden.com/arizona/marana.