When to plant in Sierra Vista Southeast, AZ
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Sierra Vista Southeast, Arizona — is derived from the closest NOAA station with complete climate normals.
Zone 8b means many perennials and even some tender shrubs overwinter in Sierra Vista Southeast, while your frost dates still decide when annuals go out.
The average last spring frost in Sierra Vista Southeast is now 20 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SIERRA VISTA · 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 Sierra Vista Southeast’s own odds, recorded at SIERRA VISTA.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 4 | Apr 20 | Apr 5 | Oct 15 | Oct 30 | Nov 12 |
| 32°F | Apr 21 | Apr 5 | Mar 15 | Oct 23 | Nov 9 | Nov 23 |
| 28°F | Apr 5 | Mar 15 | Feb 21 | Nov 4 | Nov 21 | Dec 5 |
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 Sierra Vista Southeast, 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.
Sierra Vista Southeast planting FAQ
When is the last spring frost in Sierra Vista Southeast, AZ?
Plan for the last spring frost in Sierra Vista Southeast around April 5 (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 Sierra Vista Southeast, AZ?
Expect Sierra Vista Southeast's first fall frost near November 9 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Sierra Vista Southeast in?
Sierra Vista Southeast is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Sierra Vista Southeast?
There are roughly 218 frost-free days in Sierra Vista Southeast (a long growing season), running from the average last frost around April 5 to the first fall frost near November 9.
When should I plant tomatoes in Sierra Vista Southeast?
In Sierra Vista Southeast, start tomato seeds indoors around February 8–February 22, then transplant seedlings outdoors around April 12 once the danger of frost has passed.
Never miss a window in Sierra Vista Southeast
An email when it’s time to start seeds, transplant, and sow — timed to Sierra Vista Southeast’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Sierra Vista · 15 km
- Douglas · 65 km
- Nogales · 69 km
- Rio Rico · 73 km
- Vail · 78 km
- Green Valley · 86 km
- Sahuarita · 89 km
- Tucson · 99 km
Frost dates recorded at SIERRA VISTA, 11 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 Sierra Vista Southeast, AZ — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00027880. Retrieved from https://blissgarden.com/arizona/sierra-vista-southeast.