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#3 on this list
Rocky Mountain National Park
Colorado
Elk rut in Moraine and Horseshoe parks; aspen gold on Trail Ridge.
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#4 on this list
Acadia National Park
Maine
Warm ocean, fewer people, and early color on the hills.
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Specs side by side
| Spec | Rocky Mountain National Park | Acadia National Park |
|---|---|---|
| Location | Front Range, Colorado | Mount Desert Island, Maine |
| Highest Elevation | 14,259 feet (Longs Peak) | — |
| Peak Season | Mid-September for foliage and rut | — |
| Timed Entry | Required through mid-to-late October | — |
| Alpine Transit | Trail Ridge Road (closes with heavy snow) | — |
| Primary Gateways | Estes Park (east), Grand Lake (west) | — |
| Highest Point | — | Cadillac Mountain (1,530 feet) |
| September Average High | — | 66°F to 70°F |
| September Average Low | — | 48°F to 52°F |
| Primary Rock Type | — | Cadillac Mountain pink granite |
| Entry Fee | — | $35 per vehicle (7-day pass) |
What our reviewers liked and didn't
Rocky Mountain National Park
- Stable autumn weather windows with vastly reduced afternoon thunderstorm risk
- Peak elk rut activity with active bugling throughout low-elevation meadows
- Brilliant fall foliage as aspen groves peak along montane drainages
- High-altitude driving across Trail Ridge Road remains open before winter snows
- Strict timed-entry permit system and severe parking congestion at top trailheads
- Rapid temperature drops and sudden early-season alpine snow hazards
- Thin air and high elevation demand serious physical acclimatization
Acadia National Park
- Substantial drop in tourist congestion compared to peak July and August
- Cool, bug-free hiking temperatures paired with exceptionally clear coastal air
- Exposed iron-rung routes reopen following summer peregrine nesting closures
- Extensive car-free carriage road system ideal for gravel cycling and distance running
- Wet granite ledges become dangerously slippery in coastal mist or light rain
- Cadillac Mountain sunrise vehicle permits still sell out days in advance
- Island Explorer shuttle system scales back service routes after Labor Day
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