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When does it first snow in Alamosa, CO?

At Alamosa, the typical date of the first measurable snowfall (0.1 inch or more in a day) is Nov 2. That is the median over the last 30 snow seasons: half of seasons saw it earlier, half later. In about 1 season in 10 it came by Oct 13, and in 1 in 10 not until Nov 28 or later. The earliest was Sep 8 (2020-21) and the latest Dec 10 (2000-01). A first snowfall of at least 1 inch in a single day typically arrives around Nov 16, and 100% of seasons had one. The first freeze of fall (a low of 32°F or colder) typically comes around Sep 14, and the last freeze of spring around Jun 12.

This season so far (2026-27, data through Oct 16, 2026): no measurable snow recorded yet; first freeze (32°F or colder) Sep 11 at this station. Compare with the typical dates above. This is observed data and can lag by a day or two, and it is not a forecast.

Nov 2Median first measurable snow (0.1"+)

Nov 16Median first 1"+ snowfall

26.8"Average snowfall per season

30%Chance of white Christmas (1"+ on ground Dec 25)

Sep 14Median first fall freeze (≤32°F)

Jun 12Median last spring freeze (≤32°F)

96Median freeze-free days between

First snowfall dates at Alamosa

First day with…	Median date	Typical range (10th–90th pct)	Earliest in 30 seasons	Latest in 30 seasons	Seasons with one
0.1" of snow or more (measurable)	Nov 2	Oct 13 – Nov 28	Sep 8 (2020-21)	Dec 10 (2000-01)	100%
1" of snow or more	Nov 16	Oct 14 – Dec 14	Sep 8 (2020-21)	Jan 27 (1999-00)	100%
3" of snow or more	Dec 15	Oct 21 – Mar 27	Sep 8 (2020-21)	Apr 30 (1998-99)	97%

Based on 30 seasons (July–June, 1995-96 to 2024-25) with at least 85% complete daily snowfall records at the station. Dates are for a single day’s snowfall, so "1 inch" means one calendar day with 1" or more, not total accumulation.

Chance the first snow has already happened by a given date

Snowfall	By Nov 1	By Dec 1	By Jan 1
0.1"+ (measurable)	50%	90%	100%
1"+	30%	73%	93%

In spring, the last measurable snowfall of the season typically falls around Apr 28 (median).

White Christmas odds in Alamosa

NOAA defines a white Christmas as at least 1 inch of snow on the ground on the morning of December 25. Using the last 30 years of daily snow-depth records (1995–2024) at this station, Alamosa had that in 30% of years, at least 3 inches in 17%, and at least 6 inches in 7%. The average depth on Dec 25 was 0.9 inches and the deepest was 6 inches. New snow was falling (0.1" or more) on Christmas Day itself in 23% of years. Based on 30 years with a recorded depth on Dec 25.

Chance of at least 1 inch of snow on the ground, by date

Share of the last 30 years with 1"+ snow depth within 3 days of each date. Snow cover is most likely around Jan 16 (44%). Red line: Dec 25.

First and last freeze dates in Alamosa

Threshold	Event	Median date	Typical range (10th–90th pct)	Earliest / latest	Years with one
32°F or colder (freeze)	First in fall	Sep 14	Sep 3 – Sep 22	Aug 9 (2009) / Oct 4 (1997)	100%
32°F or colder (freeze)	Last in spring	Jun 12	May 28 – Jun 23	–	100%
28°F or colder (hard freeze)	First in fall	Sep 23	Sep 14 – Oct 9	Sep 9 (2001) / Oct 16 (2024)	100%
28°F or colder (hard freeze)	Last in spring	May 25	May 13 – Jun 10	–	100%

Based on the station’s daily minimum temperature, 1995–2024. “Freeze” here means a daily low at or below the threshold, which is not the same as visible frost. Your yard can differ by several degrees and days from an airport weather station, so use these as planning odds, not guarantees.

The median stretch between the last spring freeze and the first fall freeze (the freeze-free season) was about 96 days.

Nearby weather stations

Source station: Alamosa-Bergman Fld (USW00023061), elevation 7,537 ft. Data: NOAA NCEI GHCN-Daily. Computed by First Snow Dates; how we calculate this. Historical averages only; for a forecast see weather.gov.

Planning for winter? Heat pump vs gas furnace, propane and oil: heating cost in Colorado (on our sister site PlugVsPump, from EIA prices).