USDA Hardiness Zone 5b
Frost Dates for 83014 — Wilson, Wyoming
NOAA 1991–2020 normals from Moose, WY (6,444 ft), 12 miles northeast.
Updated
In Wilson, the last spring frost (32°F) is around June 20 in half of years and has passed by July 9 in nine years out of ten. The first fall frost comes around August 31, as early as August 12 one year in ten, leaving a typical freeze-free season of 70 days (NOAA, Moose, WY).
- Last spring frost
- June 20
- First fall frost
- August 31
- Growing season
- 70 days
- Hardiness zone
- 5b
50% probability
50% probability
freeze-free, 50%
-15 to -10°F (-26.1 to -23.3°C) coldest night
- First snow
- October 24
- Last snow
- April 15
- Winters with snow
- 100%
- Snow per year
- 78.2"
median, 1991–2020
median, 1991–2020
20 of 20 observed
NOAA normal
Frost risk by date in Wilson
Half of springs at Moose, WY see their last 32°F night by June 20; only one in ten is past it by June 5, and one in ten still has one after July 9. Planting tender crops after June 27 leaves a 30% risk of a frost on them, after July 1 20%, and after July 9 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 91% of the 33 Wyoming stations behind this site's ZIP pages.
In fall the first 32°F night comes by August 31 in half of years, as early as August 12 one year in ten, and holds off past September 13 one year in ten. A hard freeze of 28°F follows 13 days later, around September 13; in spring the one-in-ten date for 28°F is June 21, 18 days before the 32°F one. The freeze-free season lasts 70 days in a typical year, the shortest of the 33 Wyoming stations; it reaches 93 days one year in ten and falls short of 43 one year in ten. On average 244 nights a year drop to 32°F or below. Severe cold of 16°F or below comes every winter, usually between October 21 and April 19.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | too rare for a date | ||||||||
| 32°F | Jun 5 | Jun 11 | Jun 15 | Jun 18 | Jun 20 | Jun 24 | Jun 27 | Jul 1 | Jul 9 |
| 28°F | May 12 | May 18 | May 23 | May 28 | Jun 2 | Jun 7 | Jun 11 | Jun 16 | Jun 21 |
| 24°F | Apr 29 | May 2 | May 5 | May 8 | May 12 | May 15 | May 19 | May 24 | Jun 2 |
| 20°F | Apr 15 | Apr 20 | Apr 23 | Apr 26 | Apr 29 | May 1 | May 3 | May 7 | May 12 |
| 16°F | Apr 5 | Apr 9 | Apr 12 | Apr 16 | Apr 19 | Apr 21 | Apr 24 | Apr 28 | May 1 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | too rare for a date | ||||||||
| 32°F | Aug 12 | Aug 20 | Aug 25 | Aug 28 | Aug 31 | Sep 3 | Sep 5 | Sep 9 | Sep 13 |
| 28°F | Aug 30 | Sep 4 | Sep 7 | Sep 10 | Sep 13 | Sep 17 | Sep 20 | Sep 25 | Sep 30 |
| 24°F | Sep 12 | Sep 17 | Sep 21 | Sep 24 | Sep 27 | Sep 30 | Oct 3 | Oct 7 | Oct 12 |
| 20°F | Sep 22 | Sep 27 | Oct 1 | Oct 5 | Oct 8 | Oct 12 | Oct 15 | Oct 18 | Oct 23 |
| 16°F | Oct 1 | Oct 7 | Oct 12 | Oct 17 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 3 |
Freeze probabilities 1991–2020 at Moose, WY, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 83014 →Compare Wilson with another place →
Weather by month in Wilson
July is the warmest month at Moose, WY, averaging 82°F by day and 44°F at night; January is the coldest at 27°F and 1°F. A freezing night is all but certain in every month from September to June (a 90% chance or more). No month is safe from a 32°F night: even the warmest has at least a 10% chance. In spring, July still brings one in 21% of years.
Warmth for growing adds up to 1,116 growing degree days a year (base 50°F), fewer than at 97% of the 33 Wyoming stations. 20% of them (228) have built up by the end of June, and July adds the most, 396. Precipitation totals 23.0 inches a year, most in December (2.8") and least in July (1.2"); May to September bring 34% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 27 | 1 | 2.6 | 100% | 31 | 0 |
| Feb | 32 | 6 | 2.2 | 100% | 28 | 0 |
| Mar | 42 | 15 | 1.8 | 100% | 31 | 0 |
| Apr | 50 | 24 | 1.8 | 100% | 28 | 2 |
| May | 62 | 33 | 2.0 | 100% | 16 | 50 |
| Jun | 71 | 39 | 1.8 | 91% | 6 | 176 |
| Jul | 82 | 44 | 1.2 | 21% | 1 | 396 |
| Aug | 81 | 42 | 1.2 | 51% | 2 | 350 |
| Sep | 71 | 34 | 1.6 | 99% | 14 | 130 |
| Oct | 56 | 25 | 1.7 | 100% | 28 | 11 |
| Nov | 39 | 15 | 2.3 | 100% | 29 | 0 |
| Dec | 28 | 4 | 2.8 | 100% | 31 | 0 |
Monthly normals 1991–2020 at Moose, WY (6,444 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Driggs, ID, 19 miles northwest of Wilson and 324 feet lower, has a last frost 7 days earlier (June 13), a first frost 9 days later (September 9), a season 16 days longer.
When it snows in Wilson, Wyoming
The first measurable snow (0.1 inch or more) in Wilson usually arrives around October 24, and the last of the season around April 15. Those are the middle dates across the winters of 1991–2020 at Jackson, WY, 5.6 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 66 days after the last snow.
Planting calendar for 83014
| When | What to do |
|---|---|
| April 11 – April 25 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| April 25 – May 9 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| May 23 – June 6 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| June 20 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by June 8 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by August 17 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| August 31 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 83014 is 12 miles from Moose, WY, which stands at 6,444 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 83001 (Jackson). The 2023 USDA Plant Hardiness Zone Map lists ZIP 83014 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.