Rocky Mountain National Park
Sweet spot months in Rocky Mountain National Park (RMNP) without the heavy summer crowds, open Trail Ridge Road and a good chance of nice weather are late May until early June or September after Labor Day (mid-week) until mid-October. However, snow is possible at both times. September is also great for wildlife because of the elk rutting season (peak mid-September to mid-October). In fall the air is clear and crisp and the skies are blue.
The stunning Trail Ridge Road is open from Memorial Day (last Monday in May) until mid-October. The official closing date is October 23, but they often close it a few days before that date. Even in June or September, it’s possible that it’s closed for hours or a day due to snow, often between 8 PM and 10 AM.
Weather / Wildflowers / Wildlife
Regardless of the season: The higher into the mountains you go, the colder it gets. In general, RMNP is known for its extreme weather patterns which can change very quickly, as well as wide variations between day and nighttime temperatures. Find detailed weather data here: Climate Estes Park - Colorado
April - May (spring): The weather is unpredictable: Up to 70°F (21°C) on one day and a temperature drop together with blizzards on the next day. It varies between warm and cold, wet and dry. Many trails are still snow-covered well into May, often even at the end of May. Snowfall is not uncommon. Temperature ranges between 70°F (21°C) and 60°F (16°C)
June - August (summer): The most comfortable weather is from July to August: the temperature climbs up to 75°F (24°C). However, afternoon thunderstorms and wind are normal. Always prepare for temperature drops of 10-20 degrees Fahrenheit. Keep in mind that the highest elevation trails are snow covered well into June. Wildflowers are in bloom from late June to early August.
September - November (fall): Usually a great time as well. September and October bring clear, crisp air, blue skies, and generally dry weather. However, early snow is already possible. Leaves start changing colors in mid-September and the beautiful fall foliage lasts until early October in most years. Elk rutting season begins in September as well and continues through mid-October at least. Like in spring you need to be flexible, check the forecast and bring gear for various conditions.
November/December - March (winter): Snow and arctic conditions. However, lower elevations on the east slope of Rocky Mountain National Park are usually free of deep snow. The west side of the park experiences more snow, less wind, and clear cold days during these months. Most high country overnight trips require gear suitable for freezing temperatures. Skiing and snowshoeing conditions are best in January, February, and March. There are lots of other exciting activities in Winter: Sledding at Hidden Valley, Winter Wildlife Viewing, Ice Climbing and more. Visit NPS Rocky Mountain Winter Activities and 20 Things To Do in the Winter.
Avoiding Tourist Crowds
With over 4 million visitors each year, Rocky Mountain National Park is one of the most visited Parks in the U.S. Expect the most crowds in summer and fall. The busiest months are June until August, with heavy crowds in July/August. During the week it starts to thin out after Labor Day in September (first Monday in September), but not on weekends. Visiting mid-week in September means significantly fewer crowds as well as enjoying elk rutting and pleasant fall temperatures at the same time.
In general from July through September: Avoid weekends and/or go early in the morning to beat the crowds. In the peak months arrive between 7 and 8 AM to get a parking spot. Usually, it starts to get busier after 9 AM. Especially popular entrances like Estes Park or trailheads like Bear Lake Trail are extremely busy. In general, the west side (Grand Lake) is less crowded than the Eastern side (Estes Park Entrance). Regardless of the month, season or entrance: Go as early as possible, head out on a trail, hike a couple of miles from the busy areas and you won’t see too many others.
Rocky Mountain National Park’s 415 square miles encompass and protect spectacular mountain environments. Over 300 miles of hiking trails, wildflowers and wildlife. Visit our Bear Lake Trail description as well
Trail Ridge Road
"Almost every 1/2 mile a parking lot for a scenic overlook!" Covering the 48 miles between Estes Park on the park's east side and Grand Lake on the west, Trail Ridge Road is one of the most spectacular and scenic drives. Eleven miles of this road travel above treeline, the elevation near 11,500 feet. As it winds across the tundra's vastness to its high point at 12,183 feet elevation, Trail Ridge Road offers amazing views, many wildlife sightings and spectacular alpine wildflower exhibitions, all from the comfort of your car. More details: Trail Ridge Road NPS
Expert Insider Tips
- Trail Ridge Road Timeline: Excellent description from a local for a drive from Estes Park to Grand Lake on the Trail Ridge Road.
- Most underrated and less crowded trails like the North Inlet Trail.
7 More Tips to Avoid Crowds
- Peak season with massive crowds is from mid June until early September. Labor Day weekend (3 day holiday) is in the Top 10 visitation days. Crowds start to dissipate after Labor Day (first Monday in September).
- In September it gets slightly less busy but 50% more people visit on weekends. Go on a weekday in September to enjoy a quieter visit. The last weekends in September (foliage + elk rutting) have the highest attendance throughout the year.
- The west side (Grand Lake) of RMNP is less crowded than the Eastern side (Estes Park). More than 80% of the visitors arrive through the east entrances of the park.
- In peak season or on weekends: Start your scenic drive on Trail Ridge Road between 7 and 8 AM.
- Go hiking! Head out on a trail, walk a couple of miles from the busy spots and you won't see too many others. However, start your hikes as early as possible or/and avoid popular trails like Bear Lake Trail in peak season.
- Not an early morning bird? Hike late and start at 3 PM. However, some park rangers hesitate to suggest this time of day due to possible afternoon thunderstorms.
- Rough deadlines for getting parking spots at different trailheads: Glacier Gorge: 6 AM, Bear Lake: 7:30 AM, Wild Basin Corridor: 9:30 AM.
Quick Facts and Tips
- Always check the weather forecast right before you go.
- Unpredictable weather and summer afternoon thunderstorms are not uncommon.
- Dress in layers, bring rain gear and pack plenty of water.
- The Longs Peak and St. Vrain trailheads are entrances where it is legal to enter RMNP without paying a fee.
- Drive the Old Fall River Road
- Check the list of Hiking Trails
- Check the official Road Status report
- Check the official Maps
- Additional Resources: Wildlife Watching NPS and Places To Go NPS
- Slow down, be quiet, turn off your cell phone and every other device! Just look, listen, smell and feel this pure and majestic area. Absorb the experience of being there, … on top of the world.
Where to Stay (bookmark the links)
- Appenzell Inn: We had the best experience at the Appenzell Inn: Great views, super friendly staff, very clean, huge and nice rooms, really good food. Tip: Book two or three months in advance.
- The Blue Door Inn: Budget Tip! Looks like a motel from the outside, but they got really nice rooms. Renovated just recenctly (early 2017).
- Rocky Mountains National Park Hotels: Explore a full list of nearby hotels and lodges: We like booking.com, as you can almost always cancel without any charges and the booking is 100% safe.
Don't get lost! We highly recommend this map for anywhere you plan to go at RMNP. It's a true life saver and the best one available for this park. We have used it for ourselves. Excellent quality paper and beautiful colors. Some hikers say they have used this one for over 10 or even 20 years. It's also water resistant and very tough. That means you can use it for a really long time.
click image for details and reviews!
Tip: View the stunning video (below the photos) by Evan Schneider who visited at the end of September.