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#1 on this list
Glacier National Park
Montana
Going-to-the-Sun Road typically opens late month; waterfalls peak.
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- Specification researched
#2 on this list
Yellowstone National Park
Wyoming
All roads open; long daylight for geyser basins and wildlife.
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Specs side by side
| Spec | Glacier National Park | Yellowstone National Park |
|---|---|---|
| Location | Northwestern Montana | Northwestern Wyoming, Montana, Idaho |
| June Temperatures | 40°F to 72°F; sudden freezing shifts possible | — |
| Primary Gateways | West Glacier, St. Mary, Two Medicine | — |
| Core Highlight | Going-to-the-Sun Road and alpine cirques | — |
| Required Passes | Park pass plus corridor vehicle reservations | — |
| Apex Wildlife | Grizzly and black bears, moose, bighorn sheep | — |
| Total Area | — | 2,219,789 acres |
| Average Elevation | — | 7,500 to 8,000 feet |
| June Road Status | — | All park entrances and major passes open |
| Primary Hazards | — | Bison encounters, thermal scalding, bears |
| Backcountry Permits | — | Required year-round via Recreation.gov |
What our reviewers liked and didn't
Glacier National Park
- Peak runoff delivers magnificent, roaring waterfalls across every mountain drainage
- Car-free cycling on upper Going-to-the-Sun Road before the full automotive opening
- High wildlife density and visibility along lower riverbanks and valley floors
- Noticeably smaller tourist crowds than the peak summer rush of July and August
- High-elevation passes remain impassable or require technical snow travel skills
- Going-to-the-Sun Road vehicle access is not guaranteed until late in the month
- Unpredictable spring storms bring sudden driving rain and high-elevation snowfall
Yellowstone National Park
- All major park roads and high mountain passes fully open by June
- Peak season for newborn wildlife calves and predator activity
- Fifteen-plus hours of daylight for early and late excursion windows
- Waterfalls and thermal features surge with peak spring snowmelt runoff
- Severe vehicle traffic and parking gridlock at popular geyser basins
- Volatile mountain weather brings sudden freezes and heavy summer hail
- High-elevation backcountry routes remain blocked by snowdrifts into July
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