Last frost date in Sierra Vista, Arizona
April 5
Average last frost in spring. In an early year (1 in 10) it's over by March 15; in a late year (1 in 10) it comes after April 21.
November 9
Average first frost in fall. 1 year in 10 it comes by October 23.
Source: NOAA U.S. Climate Normals 1991–2020, station Sierra Vista (USC00027880), 2.8 miles from Sierra Vista, elevation 4,606 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 15 | Apr 5 | Apr 21 |
| First frost in fall | Oct 23 | Nov 9 | Nov 23 |
Frost-free days in an average year: 216
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 20 | Oct 30 |
| Frost (32°F) | Every year | Apr 5 | Nov 9 |
| Hard freeze (28°F) | Every year | Mar 15 | Nov 21 |
Nights at 32°F or colder in an average year: 45
What to plant now in Sierra Vista
- Mustard greensAug 15 – Nov 1Now
- Garden peasSept 1 – Nov 1Now
- ParsleySept 1 – Nov 15Now
- RadishesSept 1 – Nov 15Now
- SpinachSept 15 – Nov 1Now
- Corn saladOct 1 – Dec 1Now
- Onion setsOct 1 – Dec 1Now
- Upland cressOct 1 – Dec 1Now
- Asparagus plantsDec 1 – Jan 1Soon
- Spring planting calendar for an average last frost around April 10 Sierra Vista: April 5
- Fall planting calendar for an average first frost around November 10 Sierra Vista: November 9
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
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