Island Park Caldera
Crater Large volcanic caldera with geothermal features in Idaho
Broad volcanic caldera in eastern Idaho with high forests, trout rivers and snowmobiling; anglers and backcountry skiers use its dispersed recreation access.
How to Get to Island Park Caldera #
Drive via US‑20/US‑26 from Idaho Falls or via Interstate approaches; Island Park is a rural area best accessed by car. Use regional maps to plan routes and check for seasonal road closures.
Tips for Visiting Island Park Caldera #
- Drive slowly on US‑20/US‑26 approaches - animal crossings and sudden weather changes can surprise visitors.
- Fish and boat permits may be needed for lakes within the caldera - check Idaho Fish and Game regulations before launching.
- If using the area as a base for Yellowstone or Grand Teton side trips, allow extra days: the caldera's scenery rewards patience and exploration.
Best Time to Visit Island Park Caldera #
Summer for hiking and geology; winter for snow recreation but expect limited access.
Weather & Climate near Island Park Caldera #
Island Park Caldera's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with mild summers (peaking in July) and freezing winters (coldest in December). Temperatures range from -15°C to 26°C. Moderate rainfall (699 mm/year).
January
January is freezing with highs of -3°C and lows of -15°C. The wettest month with 88 mm of rain.
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February
February is freezing with highs of 0°C and lows of -14°C. Moderate rainfall (67 mm).
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March
March is freezing with highs of 4°C and lows of -10°C. Moderate rainfall (62 mm).
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April
April is cold with highs of 9°C and lows of -5°C. Moderate rainfall (52 mm).
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May
May is cold with highs of 15°C and lows of 0°C. Moderate rainfall (63 mm).
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June
June is cool with highs of 21°C and lows of 4°C. Moderate rainfall (58 mm).
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July
July is cool with highs of 26°C and lows of 6°C. Moderate rainfall (37 mm).
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August
August is cool with highs of 26°C and lows of 6°C. Moderate rainfall (38 mm).
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September
September is cool with highs of 20°C and lows of 1°C. Moderate rainfall (43 mm).
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October
October is cold with highs of 13°C and lows of -4°C. Moderate rainfall (43 mm).
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November
November is freezing with highs of 3°C and lows of -9°C. Moderate rainfall (67 mm).
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December
December is the coldest month with highs of -3°C and lows of -15°C. Regular rainfall (81 mm).
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