Boulder Snowfall Totals & Accumulation Averages

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This page pulls together information on when, how much and how often Boulder, Colorado has snow.

There are data and descriptions here of how many days it snows and the total amount of snowfall that Boulder usually gets. There are also monthly and yearly counts of the days that Boulder normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Boulder can expect the first and last snowfalls of the season.

All the numbers are averages, based on weather data gathered from 1981 to 2010 near Boulder's Green Mountain Memorial Park.

How Often it Snows in Boulder

This first table lists monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).

Average total snowfall and days with fresh snow in Boulder
Days   Inches Centimetres
  5.1 January 10.7   27.2
  6.3 February 12.4   31.5
  6.4 March 17.7   45.0
  4.1 April 11.7   29.7
  0.5 May   0.8     2.0
  0.5 September   1.0     2.5
  1.8 October   5.6   14.2
  4.8 November 14.2   36.1
  5.5 December 14.2   36.1
35.0 Year 88.3 224.3

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 20.8 inches of snow. Another 25 percent of years receive less than 6.4 inches for the month.

Similarly in January, fresh snowfall in the heaviest years amounts to over 15.8 inches, while the lightest years get less than 5.6 inches.

New snow for February ranges from over 16.7 inches in heavy snowfall years to under six inches in light years.

March has even greater potential for getting a lot of snow. Once every four years, at least 23 inches of snow lands in Boulder during March. Even the lightest years still receive over 11.1 inches this month.

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 half an inch of snow.

The season's last snowfall typically happens in April. About once every four years, May receives a light snowfall.

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 11 days a year on average, the amount of new snow totals three inches or more.

Snowstorms of over five inches a day normally occur five 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
  3.0   1.4 January 0.5 0.1
  3.9   1.3 February 0.6 0.0
  4.1   2.1 March 1.2 0.3
  2.7   1.4 April 0.7 0.2
  0.2   0.1 May 0.0 0.0
  0.3   0.2 September 0.1 0.0
  1.0   0.7 October 0.4 0.1
  3.0   1.9 November 1.0 0.2
  3.3   1.6 December 0.7 0.3
21.5 10.7 Year 5.2 1.2

How Much Snow Normally Accumulates in Boulder

For about two-fifths of winter days, Boulder has at least an inch of snow on the ground.

Snow mostly accumulates during December and January. Typically, on six days in December and another five in January, the snow covering Boulder gets to five 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
13.4   8.5 January   4.5 0.8
10.4   6.3 February   2.8 0.3
  6.5   3.9 March   2.1 0.5
  2.4   1.5 April   0.9 0.2
  0.1   0.0 May   0.0 0.0
  0.2   0.2 September   0.1 0.0
  1.5   1.0 October   0.6 0.2
  7.6   4.4 November   2.7 0.6
14.3   8.9 December   5.5 1.1
56.4 34.7 Year 19.2 3.7
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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