Frost dates · USDA zone 8b
Frost dates for St. George, UT
St. George, UT sees its last 32 °F night of spring around March 14 and its first of fall around November 10 — a 239-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 | Feb 27 | Nov 22 |
| Median — 1 year in 2 | Mar 14 | Nov 10 |
| 1 year in 10 | Apr 6 | Oct 27 |
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: 239 days median, at least 212 in 9 years of 10, at least 260 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 Feb 27 and first of Nov 20.
St. George planting calendar, 2027
Every row runs from the median last frost (Mar 14) and median first frost (Nov 10) 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) | Dec 20 | Feb 14 | Jun 4 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Mar 14 | Apr 13 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Feb 28 | Feb 28 | Apr 14 | 45 from sow |
| Genovese BasilGenovese | Feb 14 | Mar 28 | May 27 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Jan 17 | Mar 21 | Jun 4 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Jan 3 | Mar 28 | Jul 1 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Jan 17 | Mar 21 | Jun 4 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Jan 17 | Mar 21 | Jun 9 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Jan 17 | Mar 21 | Jun 9 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Feb 28 | Feb 28 | May 9 | 70 from sow |
| TomatilloToma Verde | Jan 31 | Mar 21 | May 30 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Jan 31 | Mar 21 | Jun 4 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Jan 31 | Mar 21 | Jun 9 | 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 St. George grow?
Each sauce, scheduled for a St. George container garden: when the first seeds go in and when enough fruit has ripened for one batch.
St. George frost questions
When is the last frost in St. George, UT?
The median last 32 °F freeze at ST GEORGE, UT is March 14: half of years see a later one. One year in ten, a freeze still comes after April 6; nine years in ten, it comes after February 27. Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in St. George, UT?
The median first 32 °F freeze of fall is November 10. One year in ten it arrives before October 27; nine years in ten, before November 22.
How long is the growing season in St. George, UT?
239 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 212 days; one year in ten, at least 260 days.
What growing zone is St. George, UT?
USDA hardiness zone 8b, per the 2023 USDA Plant Hardiness Zone Map for ZIP 84790. 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 St. George, UT?
Start Roma VF (determinate paste) seeds indoors around Jan 31 and transplant around Mar 21, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Apr 6. First ripe fruit lands around Jun 4.
When should I plant peppers in St. George, UT?
Sow jalapeño indoors on a heat mat around Jan 17; transplant no earlier than Mar 21, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Jun 4.
Nearby in Utah
- Spanish Forklast frost Apr 25
- Eagle Mountainlast frost Apr 30
- Provolast frost Apr 18
- Saratoga Springslast frost Apr 30
- Oremlast frost Apr 19
- American Forklast frost Apr 17
All Utah frost dates → · How frost-date math drives a sowing calendar →