Last frost date in Jackson, Wyoming
June 20
Average last frost in spring. In an early year (1 in 10) it's over by June 5; in a late year (1 in 10) it comes after July 9.
August 31
Average first frost in fall. 1 year in 10 it comes by August 12.
Source: NOAA U.S. Climate Normals 1991–2020, station Moose (USC00486428), 12.9 miles from Jackson, elevation 6,444 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | June 5 | June 20 | July 9 |
| First frost in fall | Aug 12 | Aug 31 | Sept 13 |
An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.
Frost-free days in an average year: 70
Planting calendar for Jackson
Fall planting
USDA dates for places whose average first freeze is about August 30 (Jackson: August 31).
- Broccoli plantsMay 1 – June 1 (past for this year)
- Brussels sprouts plantsMay 1 – June 1 (past for this year)
- Cabbage plantsMay 1 – June 1 (past for this year)
- Cauliflower plantsMay 1 – June 1 (past for this year)
- Celery and celeriac plantsMay 1 – June 1 (past for this year)
- LeeksMay 1 – June 1 (past for this year)
- Onion plants plantsMay 1 – June 10 (past for this year)
- Onion seedMay 1 – June 1 (past for this year)
- Onion setsMay 1 – June 1 (past for this year)
- RadishesMay 1 – July 15 (past for this year)
- Chervil and chivesMay 10 – June 10 (past for this year)
- Garden peasMay 10 – June 15 (past for this year)
- BeetsMay 15 – June 15 (past for this year)
- CarrotsMay 15 – June 15 (past for this year)
- Chinese cabbageMay 15 – June 15 (past for this year)
- Collards plantsMay 15 – June 15 (past for this year)
- Corn saladMay 15 – June 15 (past for this year)
- Florence fennelMay 15 – June 15 (past for this year)
- Head lettuce plantsMay 15 – July 1 (past for this year)
- KaleMay 15 – June 15 (past for this year)
- KohlrabiMay 15 – June 15 (past for this year)
- Leaf lettuceMay 15 – July 15 (past for this year)
- Mustard greensMay 15 – July 15 (past for this year)
- ParsleyMay 15 – June 15 (past for this year)
- ParsnipsMay 15 – June 1 (past for this year)
- PotatoesMay 15 – June 1 (past for this year)
- RutabagaMay 15 – June 15 (past for this year)
- SalsifyMay 15 – June 1 (past for this year)
- SorrelMay 15 – June 15 (past for this year)
- SpinachMay 15 – July 1 (past for this year)
- Swiss chardMay 15 – June 15 (past for this year)
- TurnipsMay 15 – June 15 (past for this year)
- Upland cressMay 15 – June 15 (past for this year)
- Witloof chicoryMay 15 – June 15 (past for this year)
- DandelionJune 1 – 15 (past for this year)
- EndiveJune 1 – July 1 (past for this year)
- Summer squashJune 10 – 20 (past for this year)
- TomatoesJune 20 – 30 (past for this year)
- Rhubarb plantsSept 1 – Oct 1 (past for this year)
USDA lists garlic, horseradish, shallots as generally spring-planted here.
Spring planting
USDA dates for places whose average last freeze is about June 10 (Jackson: June 20).
- DandelionMay 1 – 30
- LeeksMay 1 – 15
- SpinachMay 1 – June 15
- Garden peasMay 10 – June 15
- Onion plants plantsMay 10 – June 10
- Onion seedMay 10 – June 10
- Onion setsMay 10 – June 10
- ShallotsMay 10 – June 1
- Asparagus plantsMay 15 – June 1
- BeetsMay 15 – June 15
- Chervil and chivesMay 15 – June 1
- Corn saladMay 15 – June 15
- EndiveMay 15 – June 1
- Florence fennelMay 15 – June 1
- GarlicMay 15 – June 1
- Horseradish plantsMay 15 – June 1
- KaleMay 15 – June 1
- KohlrabiMay 15 – June 1
- PotatoesMay 15 – June 1
- RadishesMay 15 – June 1
- Rhubarb plantsMay 15 – June 1
- TurnipsMay 15 – June 15
- Upland cressMay 15 – June 15
- Broccoli plantsMay 20 – June 10
- Brussels sprouts plantsMay 20 – June 10
- Cabbage plantsMay 20 – June 1
- CarrotsMay 20 – June 1
- Chinese cabbageMay 20 – June 1
- Collards plantsMay 20 – June 1
- Head lettuce plantsMay 20 – June 30
- Leaf lettuceMay 20 – June 30
- Mustard greensMay 20 – June 30
- ParsleyMay 20 – June 10
- ParsnipsMay 20 – June 10
- RutabagaMay 20 – June 1
- SalsifyMay 20 – June 1
- SorrelMay 20 – June 10
- Cauliflower plantsJune 1 – 15
- Celery and celeriac plantsJune 1 – 15
- Swiss chardJune 1 – 15
- Witloof chicoryJune 1 – 15
- Summer squashJune 10 – 20
- TomatoesJune 15 – 30
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.
Nearby in Wyoming
- Cody 112 mi · last frost May 12
- Riverton 124 mi · last frost May 12
- Green River 151 mi · last frost May 24
- Rock Springs 152 mi · last frost May 24
- Evanston 153 mi · last frost June 12