San Juan Mountains

Mountains Rugged Colorado mountain range with high alpine peaks

A rugged mountain range in southwestern Colorado offering alpine hiking, backcountry skiing, historic mining towns and scenic drives such as the Million Dollar Highway.

Main image
Main image

The San Juan Mountains are a large and rugged subrange of the Rocky Mountains in southwestern Colorado, United States, known for high alpine peaks, historic mining districts and extensive backcountry terrain. The range contains numerous peaks above 4,000 metres and is geologically complex with extensive volcanic and intrusive formations.

The area is popular for hiking, backpacking, off-road driving and winter sports, and it includes scenic routes and several former mining towns such as Silverton and Ouray that are now outdoor-recreation hubs. Visitors also travel the San Juan Skyway, which passes high mountain passes and offers access to trailheads and historic sites.

Mining boomed in the late 19th and early 20th centuries; many of the towns and infrastructure remain as historic remnants and tourist attractions. Railroads and narrow-gauge lines once served the mines and today provide scenic and interpretive value.

Geographically the range occupies much of southwestern Colorado; nearest regional centres include Durango to the southwest and Montrose to the north, with numerous access roads and trails into the high country.

  • Fourteeners: Contains multiple 'fourteeners' including Uncompahgre Peak at 14,321 feet, making it a prime destination for alpine climbing and high-elevation hiking.

What to See #

  • Uncompahgre Peak: Uncompahgre Peak, the range's highest summit at 14,321 feet (4,365 metres), is a major climbing objective for hikers and mountaineers.
  • San Juan Skyway and historic towns: The San Juan Skyway, a designated scenic byway, runs through the range and links towns such as Durango, Silverton and Ouray, crossing several high mountain passes and historic mining areas.
San Juan Mountains
37.4833, -106.8173

How to Get to San Juan Mountains #

Access from towns such as Durango, Silverton and Ouray; state and forest roads penetrate into mountain valleys. Check seasonal road closures and local ranger stations for current trail information.

Tips for Visiting San Juan Mountains #

  • Plan routes by elevation and season - alpine weather in the San Juans can be abrupt and snow can arrive even in summer at high passes.
  • Many trailheads require a 4x4 or careful driving on narrow mountain roads; local ranger stations can advise on current conditions.

Best Time to Visit San Juan Mountains #

Summer for hiking and 4x4 touring; autumn for colour and fewer crowds.

Summer
Jun-Sep · 5-20°C
High-country trails and passes are usually clear; wildflowers peak mid-summer.
Autumn
Sep-Oct · -5-15°C
Leaf-peeping and early snow at higher elevations; dramatic colour shifts.
Spring
May-Jun · -5-10°C
Snowmelt creates swollen streams and variable trail conditions.

Weather & Climate near San Juan Mountains #

Climate

San Juan Mountains's climate is classified as Subarctic - Subarctic climate with cool summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -17°C to 19°C. Moderate rainfall (996 mm/year).

Temperature & Rainfall
Temperature Range
19°
Warmest Month
-17°
Coldest Month
Monthly Conditions

January

January is the coldest month with highs of -2°C and lows of -17°C. Regular rainfall (85 mm).

Comfort

-10°
Feels Like Freezing
-10°C
Temperature
-17° -2°

Weather

85 mm
Rainfall
3.9 m/s
Wind
Light Breeze

February

February is freezing with highs of -1°C and lows of -16°C. Regular rainfall (84 mm).

Comfort

-8°
Feels Like Freezing
-8°C
Temperature
-16° -1°

Weather

84 mm
Rainfall
4.1 m/s
Wind
Light Breeze

March

March is freezing with highs of 1°C and lows of -13°C. The wettest month with heavy rain (116 mm).

Comfort

-6°
Feels Like Freezing
-6°C
Temperature
-13°

Weather

116 mm
Rainfall
4.4 m/s
Wind
Light Breeze

April

April is freezing with highs of 4°C and lows of -10°C. Moderate rainfall (71 mm).

Comfort

-3°
Feels Like Freezing
-3°C
Temperature
-10°

Weather

71 mm
Rainfall
4.8 m/s
Wind
Light Breeze

May

May is cold with highs of 9°C and lows of -5°C. Moderate rainfall (49 mm).

Comfort

Feels Like Cold
C
Temperature
-5°

Weather

49 mm
Rainfall
4.6 m/s
Wind
Light Breeze

June

June is cold with highs of 15°C and lows of 0°C. Moderate rainfall (40 mm).

Comfort

Feels Like Cold
C
Temperature
15°

Weather

40 mm
Rainfall
4.0 m/s
Wind
Light Breeze

July

July is cool with highs of 19°C and lows of 4°C. Regular rainfall (82 mm).

Comfort

11°
Feels Like Cool
11°C
Temperature
19°

Weather

82 mm
Rainfall
3.3 m/s
Wind
Light Breeze

August

August is cool with highs of 18°C and lows of 3°C. Regular rainfall (97 mm).

Comfort

11°
Feels Like Cool
11°C
Temperature
18°

Weather

97 mm
Rainfall
3.2 m/s
Wind
Light Breeze

September

September is cold with highs of 15°C and lows of 1°C. Regular rainfall (90 mm).

Comfort

Feels Like Cold
C
Temperature
15°

Weather

90 mm
Rainfall
3.7 m/s
Wind
Light Breeze

October

October is cold with highs of 10°C and lows of -4°C. Regular rainfall (94 mm).

Comfort

Feels Like Cold
C
Temperature
-4° 10°

Weather

94 mm
Rainfall
3.9 m/s
Wind
Light Breeze

November

November is freezing with highs of 3°C and lows of -11°C. Regular rainfall (88 mm).

Comfort

-4°
Feels Like Freezing
-4°C
Temperature
-11°

Weather

88 mm
Rainfall
3.9 m/s
Wind
Light Breeze

December

December is freezing with highs of 0°C and lows of -16°C. Regular rainfall (100 mm).

Comfort

-8°
Feels Like Freezing
-8°C
Temperature
-16°

Weather

100 mm
Rainfall
4.0 m/s
Wind
Light Breeze

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