Rocky Mountain in December: Crowds, Weather & What to Pack

Shoulder · VisitWhen score 57/100 · #12 of 12 months

December is a quiet month with trade-offs at Rocky Mountain National Park: crowds run 16% of the July peak (126,482 average visits). Weather: highs average 36°F and lows 16°F, with 0.7″ of precipitation and 9.3 hours of daylight. Roads and services are only partly open this month — see the access note below. Computed from NPS and NOAA data.

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Rocky Mountain in December: what the park service says

December brings Rocky Mountain's winter routine: Trail Ridge Road has been closed to through travel since mid-October, and from November 15 the west side's bald eagle closure protects the communal roost near the Colorado River. The park is open around the clock, weather permitting, and the park suggests stopping at a visitor center to talk with a ranger before heading into winter terrain.

Source: NPS 1, NPS 2, NPS 3, checked 2026-11-05.

Crowds in December

Rocky Mountain averages 126,482 recreation visits in December — 16% of what July, the peak month, draws — this is the third-quietest month of the year. Trailheads and parking fill accordingly — crowds are thin by this park's standards.

Weather & daylight

Days are cold (highs average 36°F), and nights are frigid (lows average 16°F). It is typically dry (0.7″ of precipitation). Normal snowfall is 13″ — expect snow on the ground. Mid-month daylight runs 9.3 hours.

NOAA 1991–2020 monthly normals, station ESTES PARK 3 SSE, CO US (9 mi from park coordinates, 7,812 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of December.

What to pack for Rocky Mountain in December

Computed from the month's weather normals above — not a generic list.

• Insulated parka + thermal base layers — average lows of 16°F
• Traction devices (microspikes) and gaiters — 13″ normal snowfall (compare other options)
• Headlamp — only 9.3 hours of daylight in mid-December (compare other options)
• Insulated, waterproof boots — plus navigation and a basic first-aid kit — 13″ of snow is normal this month

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If your dates are flexible, consider shifting: The computed best months for Rocky Mountain are March and April.

Also at their best in December

Other parks whose computed December verdict is a best window — same NPS × NOAA formula:

• American Samoa in December — 17% of peak crowds, highs 88°F, score 66/100
• Everglades in December — 72% of peak crowds, highs 80°F, score 64/100
• Biscayne in December — 77% of peak crowds, highs 80°F, score 62/100

Common questions

See also: the best national parks to visit in December · Last verified 2026-09-24