When to plant in Sierra Vista, AZ
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Sierra Vista, Arizona — all computed from Sierra Vista's nearest NOAA weather station.
In zone 8b, Sierra Vista supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average last spring frost in Sierra Vista 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’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, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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 planting FAQ
When is the last spring frost in Sierra Vista, AZ?
Sierra Vista's average last spring frost falls near April 5 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Sierra Vista, AZ?
In Sierra Vista, the first 32°F freeze of fall lands around November 9 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Sierra Vista in?
Sierra Vista 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?
Sierra Vista has about 218 frost-free days — a long growing season — between the average last spring frost (April 5) and first fall frost (November 9).
When should I plant tomatoes in Sierra Vista?
For Sierra Vista, sow tomatoes indoors about February 8–February 22 and move the seedlings out around April 12, after the last spring frost.
Never miss a window in Sierra Vista
An email when it’s time to start seeds, transplant, and sow — timed to Sierra Vista’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Sierra Vista Southeast · 15 km
- Vail · 62 km
- Nogales · 63 km
- Rio Rico · 64 km
- Green Valley · 72 km
- Sahuarita · 74 km
- Douglas · 76 km
- Tucson · 84 km
Frost dates recorded at SIERRA VISTA, 5 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, 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.