Boulder Snowfall Totals & Accumulation Averages

How Often it Snows in Boulder

The next two tables list monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).

10-year snowfall averages in Boulder, 2010 to 2019

Days		Inches	Centi­metres
6.0	January	14.5	36.8
5.0	February	14.6	37.1
4.0	March	16.2	41.1
4.0	April	10.2	25.9
2.0	May	7.4	18.8
0.0	September	0.0	0.0
6.0	October	26.4	67.1
4.0	November	29.5	74.9
1.0	December	3.4	8.6
21.4	Year	96.1	244.0

30-year snowfall averages in Boulder, 1991 to 2020

Days		Inches	Centi­metres
5.6	January	11.3	28.7
6.5	February	15.0	38.1
6.0	March	15.7	39.9
4.9	April	14.7	37.3
0.9	May	2.0	5.1
0.5	September	1.0	2.5
2.1	October	7.0	17.8
4.8	November	13.1	33.3
5.3	December	13.0	33.0
36.6	Year	92.8	235.7

These averages don't show how much the snowfall in Boulder varies from year to year.

In December, for instance, one in four years totals over 17.8 inches of snow. Another 25 percent of years receive less than 6.1 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 15.2 inches, while the lightest years get less than 5.9 inches.

New snow for February ranges from over 18.5 inches in heavy snowfall years to under 6.5 inches in light years.

March has even greater potential for getting a lot of snow. Once every four years, at least 22.7 inches of snow lands in Boulder during March.

When Boulder Has Its First & Last Snowfalls

The first snowfall of autumn for Boulder can land as early as September, or not show up until November. More likely than not, October gets at least two inches of snow.

The season's last fresh snow comes down in April or May.

Boulder is normally free of snow each year from June to August.

How Many Snowstorms Boulder Gets

Most days of snowfall in Boulder result in at least an inch of fresh snow left on the ground. For 12 days a year on average, the amount of new snow totals three inches or more.

Snowstorms of over five inches a day normally occur six times a year. One of those days, on average involves a major blizzard that dump ten inches or more.

Number of days per month and year on average in Boulder with a total snowfall of at least 1, 3, 5 or 10 inches

1 inch 2.5 cm	3 inches 7.6 cm		5 inches 12.7 cm	10 inches 25.4 cm
3.2	1.5	January	0.6	0.1
4.0	2.0	February	0.9	0.1
3.6	1.8	March	0.9	0.4
3.3	1.8	April	1.0	0.2
0.5	0.3	May	0.2	0.0
0.3	0.1	September	0.1	0.0
1.2	0.9	October	0.5	0.1
2.8	1.7	November	0.9	0.2
3.1	1.4	December	0.8	0.2
22.0	11.5	Year	5.9	1.3

How Much Snow Normally Accumulates in Boulder

For about a third of winter days, Boulder has at least an inch of snow on the ground.

Typically on three or four days a year, the snow covering Boulder builds up to ten or more inches deep.

Average total days per month and year in Boulder with snow depth of at least 1, 3, 5 or 10 inches on the ground

1 inch 2.5 cm	3 inches 7.6 cm		5 inches 12.7 cm	10 inches 25.4 cm
12.9	7.3	January	3.5	0.4
11.0	7.4	February	4.1	0.7
5.5	3.4	March	2.0	0.5
2.9	1.7	April	1.2	0.3
0.3	0.2	May	0.1	0.0
0.1	0.0	September	0.0	0.0
1.8	1.3	October	0.7	0.2
7.0	3.9	November	2.5	0.5
13.0	7.9	December	4.2	0.8
54.5	33.1	Year	18.3	3.4