Frost dates 2026–2027

Frost dates for Torrington, Wyoming

Median (50% chance) dates of the last and first 32°F frost, from NOAA 1991–2020 climate normals at Torrington Municipal Airport, 1.1 mi away (close match).

Last spring frostMay 11
First fall frostSep 29
139 frost-free days
Last spring frostMay 111 year in 10 after May 26
First fall frostSep 291 year in 10 by Sep 16
Growing season139 daysbetween median 32°F dates
Hardiness zoneZone 5a−20 to −15°F average extreme low

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Will it freeze in Torrington in the next 7 nights?

The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 31°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).

Tonight: forecast low 31°F. Freeze.

NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.

4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.

Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.

Frost and freeze probabilities

Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.

These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.

Average first hard freeze in Torrington

The median first fall hard-freeze date (28°F) is October 8, from NOAA’s 1991–2020 Climate Normals at Torrington Municipal Airport. This is the 50% probability date, not a forecast for this year.

TemperatureLast spring date
90% · 50% · 10% chance of a later freeze
First fall date
10% · 50% · 90% chance of an earlier freeze
Season
36°F frost possible May 9 · May 22 · Jun 5 Sep 8 · Sep 21 · Oct 2 121 days
32°F freeze Apr 30 · May 11 · May 26 Sep 16 · Sep 29 · Oct 11 139 days
28°F hard freeze Apr 16 · Apr 30 · May 13 Sep 24 · Oct 8 · Oct 21 160 days
NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094053. How to read these probabilities.

Average high temperature by month

1991–2020 normals at Torrington Municipal Airport

Average low temperature by month

Months with lows near or below freezing carry frost risk

Where these frost dates come from

The frost dates for Torrington, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Torrington Municipal Airport (station USW00094053, elevation 4,205 ft), 1.1 mi from Torrington. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.

Frost dates near Torrington

CityDistanceLast spring frostFirst fall frost
Scottsbluff, NE 29 mi May 8 Oct 3
Gering, NE 31 mi May 8 Oct 3
Alliance, NE 66 mi May 11 Oct 3
Cheyenne, WY 72 mi May 14 Oct 1
Douglas, WY 79 mi May 19 Sep 23
Sidney, NE 89 mi May 15 Sep 30
Laramie, WY 90 mi Jun 7 Sep 4
Wellington, CO 104 mi May 3 Oct 6
Eaton, CO 110 mi May 2 Oct 8
Sterling, CO 112 mi Apr 30 Oct 9

Frequently asked questions

When is the last frost in Torrington?

On average, the last spring frost (32°F) in Torrington is around May 11. In about 1 year in 10 it comes after May 26, and in 9 years in 10 it comes after April 30.

When is the first frost in Torrington?

The first fall frost (32°F) usually arrives around September 29. There’s a 10% chance of a freeze by September 16 and a 90% chance by October 11.

Can it frost in Torrington after the last frost date?

Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 22.

What growing zone is Torrington?

Torrington is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 82240. See growing zones in Wyoming.

More: all Wyoming frost dates · Wyoming growing zones · frost vs. freeze