Best National Parks to Visit in Shoulder Season in the Mountain West

National parks in the Mountain West are iconic for a reason. But come summer, you’re sharing that alpine lake view with... everyone. Enter shoulder season: the sweet spot when snow is melting (or just starting to fall), wildflowers or golden aspens are doing their thing, and the trails feel like yours again. Whether you’re in it for the scenery, solitude, or just better booking odds, these are the parks to hit in spring or fall.

1. Rocky Mountain National Park, CO

Best seasons: Late May–June, mid-September–early October

Spring brings wildflowers and flowing waterfalls; fall brings glowing aspen groves and elk bugling season. Trail Ridge Road usually opens around Memorial Day, making late spring ideal for alpine views without summer traffic.

Why go now: You’ll catch snow-capped peaks with fewer crowds. Just check trail conditions—some areas stay snowy into early summer.

2. Arches National Park, UT

Best seasons: March–April, October–early November

The red rock formations of Arches are stunning year-round, but shoulder season brings cooler temps and way less foot traffic. Wake up early to hike to Delicate Arch at sunrise without roasting (or dodging a dozen selfie sticks).

Why go now: Spring desert blooms + ideal hiking weather = magic.

3. Grand Teton National Park, WY

Best seasons: Late May–June, mid-September

The Tetons are dreamy in summer, but spring is when wildlife returns and wildflowers start to pop. In fall, the foliage around Jenny Lake is peak cozy-season content. Crowds are thinner, and early snow dusts the mountains just enough.

Why go now: You’ll actually find parking. And moose. Maybe both.

4. Great Sand Dunes National Park, CO

Best seasons: April–May, late September–October

It may not have jagged peaks, but Great Sand Dunes has serious drama. Spring brings Medano Creek back to life (yes, you can wade in), while fall offers cooler hikes up the dunes and epic stargazing.

Why go now: Splashing through a seasonal creek at the base of 750-foot dunes is a flex.

5. Glacier National Park, MT

Best seasons: Late May–June, mid-September

Going-to-the-Sun Road usually opens in late June, but you can still explore the park's lower elevations before or after the summer rush. In fall, larch trees turn neon gold, and the air gets crisp in the best way.

Why go now: Glacier without the gridlock. Plus, shoulder season rates in nearby Whitefish are way more chill.

Shoulder season pro tips:

• Always check park websites for road closures and conditions.

• Pack layers—temps can swing 30+ degrees.

• Book stays in nearby towns (like Estes Park, Moab, or Jackson) for local charm and easier logistics.

Want more spring ideas? Head to our recs for wildflower hikes, artsy small towns, and road trip loops through the Mountain West.