Grand Teton National Park Rocky Mountains, USA Travel Guide
Weather conditions vary greatly by season. Summer (June-September) has warm days (70-80°F) and cool nights (40-50°F), with afternoon thunderstorms. Fall (mid-September-October) offers crisp air, stunning foliage, and cooler temperatures (50-60°F days, 20-30°F nights), with early snow possible.
Winter (November-April) brings cold conditions (20-30°F days, frequently below 0°F nights) and heavy snowfall, with many facilities closed. Spring (May-early June) weather is variable (40-60°F days), with snowmelt and rapid condition changes marking the park's awakening.
The park's elevation means strong UV radiation, even on cloudy days. Sunburn risk is high. Protect skin with Sunscreen and clothing. Mountain weather unpredictability means sunny mornings can quickly turn into afternoon thunderstorms or even snow. Always pack layers and rain gear.
Visitors might experience altitude sickness symptoms like headache, nausea, and fatigue due to lower oxygen levels at higher elevations. Allow time to adjust, stay hydrated, and avoid strenuous activity immediately upon arrival.
Peak Crowds & Full Access
All park facilities open, ideal weather for outdoor activities, abundant wildlife viewing, full ranger programs.
Highest crowds, advance booking necessary, peak prices, limited parking.
Fewer Crowds & Variable Weather
Reduced crowds, excellent wildlife viewing, potentially lower accommodation prices.
Unpredictable weather (snow possible), some facilities with limited hours or closed, high elevation trails may have snow.
Solitude & Winter Activities
Fewest crowds, unique winter landscape, cross-country skiing, snowshoeing, lowest prices.
Most park roads and facilities closed, extremely cold temperatures, specialized winter gear.
Pack layers for any time of year. Mountain weather changes quickly, and temperatures can vary significantly from morning to evening or with elevation changes.
Due to high demand, especially in summer, booking lodging and activities many months in advance is advisable.
Approximately 310,000 acres.
Grand Teton Peak, 13,770 feet (4,197 meters).
Snake River.
Jenny Lake, Jackson Lake, Leigh Lake, String Lake.
Part of the Greater Yellowstone Ecosystem.
Travelers visiting Grand Teton National Park meet standard United States entry requirements.
Grand Teton National Park lies within the United States, so U.S. Entry requirements apply.
Citizens of countries not participating in the VWP obtain a B-2 (Tourist) visa from an U.S. Embassy or consulate.
Prices vary widely based on travel style and season. The official currency is the United States Dollar (USD, $). Credit cards are widely accepted. ATMs are available in Jackson and some park lodges. Foreign currency exchange is limited; exchange currency before arriving in the region.
The wilderness environment has unique considerations. No specific vaccinations are required beyond standard U.S. Entry requirements. Ensure routine vaccinations are up-to-date. A Tetanus booster is advisable if your last one was over 10 years ago and you plan outdoor activities.
Altitude Sickness (AMS): Headache, nausea, dizziness, fatigue. Acclimatize gradually, stay hydrated, avoid alcohol. Dehydration: Dry climate and high altitude elevate fluid loss. Carry and drink ample water. A reusable water bottle is highly recommended.
Sunburn/UV Exposure: Intense sun at high altitude. Use high SPF Sunscreen, wear a Wide-brimmed hat, and Sunglasses. Insect Bites: Mosquitoes, ticks present. Use Insect repellent with DEET or picaridin. Hypothermia/Hyperthermia: Rapid weather changes cause temperature shifts. Dress in layers.
St. John's Health, a hospital in Jackson, Wyoming, offers emergency services. Limited first aid exists at some park visitor centers, but St. John's is the main medical facility for serious conditions.
St. John's Health, Jackson: (307) 733-3636
Emergency Services (Police, Fire, Medical): 911
Tap water from park facilities (visitor centers, lodges, campgrounds) is potable. Water from natural sources needs filtering or treatment. Store food properly when camping to deter wildlife.
Park tap water is safe to drink.
Filter or treat natural water sources.
Wildfires occur in late summer/early fall. Flash floods are rare but possible. Avalanches pose a risk in winter/spring backcountry. Rockfall is a potential hazard on steep trails.
Monitor weather and park alerts.
Winter backcountry use demands training and avalanche safety gear.
| Category | Consideration | Action |
|---|---|---|
| Travel Insurance | Highly recommended for medical emergencies, trip interruption, lost luggage, and emergency evacuation. | Obtain a comprehensive Policy and review coverage details. |
| Crime & Safety | Generally very safe with low crime rates. Main concerns relate to wildlife interactions or property theft. | Secure valuables; do not leave them visible in vehicles. Maintain safe distances from wildlife. |
| Emergency Contacts | 911 for all emergencies. Park Rangers for park-specific assistance. | Familiarize yourself with local numbers. For backcountry, a Satellite messenger is helpful. |
