Weather on March 20 at Great Sand Dunes

Great Sand Dunes National Park and Preserve

CORocky Mountain8,200 ft elevation
Avg High53°F
Avg Low17°F
Warmest202650°F
Coldest201019°F

Based on 56 years of data from Alamosa, CO

Elevation Note: Great Sand Dunes sits at 8,200 ft. Expect temperatures 29°F cooler than the data shown below, which comes from Alamosa, CO at a lower elevation.

Planning Your Visit

March 20th in Great Sand Dunes National Park (via Alamosa, CO) typically brings cool spring weather, with average highs around 53°F and lows near 17°F — a 36°F daily swing. Over 56 years of records, the warmest March 20th was in 2026 (50°F average), while the coldest was 2010 (19°F) — a 31°F range across recorded history. Precipitation has occurred on 18% of recorded March 20th dates, with snow falling 13% of the time (heaviest snowfall: 2.5"). The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.

The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.

Planning for March 20th in Great Sand Dunes? Bring layers as temperatures can vary throughout the day.

Year by Year History

YearHighLowPrecipSnow
202678°F22°F0"0"
202541°F7°F0"0"
202456°F19°F0"0"
202342°F13°F0"0"
202255°F13°F0"0"
202162°F22°F0"0"
202048°F18°F0"0"
201953°F17°F0"0"
201843°F10°F0"0"
201771°F27°F0"0"
201658°F12°F0"0"
201546°F30°F0.08"0"
201448°F13°F0"0"
201350°F7°F0"0"
201238°F17°F0.08"0.2"
201161°F21°F0"--
201040°F-3°F0.2"2.5"
200965°F26°F0"0"
200852°F14°F0"0"
200766°F25°F0"0"
200634°F21°F0.1"0.8"
200551°F24°F0"0"
200472°F23°F0"0"
200351°F20°F0.1"0"
200258°F11°F0"0"
200161°F18°F0"0"
200054°F24°F0"0"
199960°F21°F0"0"
199849°F16°F0"0"
199770°F20°F0"0"
199657°F7°F0"0"
199562°F17°F0"0"
199452°F25°F0.08"0"
199357°F20°F0"0"
199242°F12°F0"0"
199148°F22°F0"0"
199064°F17°F0"0"
198937°F11°F0.15"0.6"
198862°F12°F0"0"
198739°F18°F0.05"0.4"
198651°F19°F0"0"
198550°F18°F0"0"
198456°F18°F0"0"
198337°F15°F0.08"0.7"
198241°F8°F0"0"
198148°F27°F0"0"
198053°F11°F0"0"
197942°F29°F0.08"0.3"
197859°F23°F0"0"
197751°F15°F0"0"
197636°F11°F0"0"
197560°F26°F0"0"
197453°F21°F0"0"
197354°F19°F0"0"
197253°F17°F0"0"
197158°F3°F0"0"

March 20 at Nearby Parks

Holiday Weather at Great Sand Dunes

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