Frost dates · USDA zone 8b
Frost dates for Sierra Vista, AZ
Sierra Vista, AZ sees its last 32 °F night of spring around April 18 and its first of fall around November 1 — a 195-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Apr 4 | Nov 15 |
| Median — 1 year in 2 | Apr 18 | Nov 1 |
| 1 year in 10 | May 3 | Oct 18 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 195 days median, at least 174 in 9 years of 10, at least 216 days in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Apr 2 and first of Nov 14.
Sierra Vista planting calendar, 2027
Every row runs from the median last frost (Apr 18) and median first frost (Nov 1) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Jan 24 | Mar 21 | Jul 9 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Apr 18 | May 18 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Apr 4 | Apr 4 | May 19 | 45 from sow |
| Genovese BasilGenovese | Mar 21 | May 2 | Jul 1 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Feb 21 | Apr 25 | Jul 9 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Feb 7 | May 2 | Aug 5 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Feb 21 | Apr 25 | Jul 9 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Feb 21 | Apr 25 | Jul 14 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Feb 21 | Apr 25 | Jul 14 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Apr 4 | Apr 4 | Jun 13 | 70 from sow |
| TomatilloToma Verde | Mar 7 | Apr 25 | Jul 4 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Mar 7 | Apr 25 | Jul 9 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Mar 7 | Apr 25 | Jul 14 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Sierra Vista grow?
Each sauce, scheduled for a Sierra Vista container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Sierra Vista frost questions
When is the last frost in Sierra Vista, AZ?
The median last 32 °F freeze at ELGIN 5 S, AZ is April 18: half of years see a later one. One year in ten, a freeze still comes after May 3; nine years in ten, it comes after April 4. Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Sierra Vista, AZ?
The median first 32 °F freeze of fall is November 1. One year in ten it arrives before October 18; nine years in ten, before November 15.
How long is the growing season in Sierra Vista, AZ?
195 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 174 days; one year in ten, at least 216 days.
What growing zone is Sierra Vista, AZ?
USDA hardiness zone 8b, per the 2023 USDA Plant Hardiness Zone Map for ZIP 85613. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Sierra Vista, AZ?
Start Roma VF (determinate paste) seeds indoors around Mar 7 and transplant around Apr 25, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for May 3. First ripe fruit lands around Jul 9.
When should I plant peppers in Sierra Vista, AZ?
Sow jalapeño indoors on a heat mat around Feb 21; transplant no earlier than Apr 25, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Jul 9.
Nearby in Arizona
- Tucsonlast frost Feb 5
- Oro Valleylast frost Apr 2
- Maranalast frost Apr 2
- Casa Grandelast frost Feb 5
- Queen Creeklast frost Feb 1
- Maricopalast frost Feb 23
All Arizona frost dates → · How frost-date math drives a sowing calendar →