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Colorado, USA · North America · northern hemisphere
Rocky Mountain National Park is at its best for hiking in July to September. Good but not prime in June and October. Crowds peak in July and bottom out in February.
| J | F | M | A | M | J | J | A | S | O | N | D | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hiking | 13 | 14 | 15 | 16 | 42 | 71 | 89 | 89 | 92 | 63 | 16 | 13 |
| Lakes & Coastline | 13 | 14 | 15 | 42 | 63 | 91 | 89 | 91 | 91 | 71 | 16 | 13 |
| Wildlife | 15 | 15 | 15 | 15 | 42 | 67 | 67 | 67 | 90 | 90 | 67 | 15 |
| Crowds |
Swipe the table sideways for the rest of the year.
A third of the park is above the treeline and Trail Ridge Road crosses at 3,700m — which means altitude is the real constraint, not distance, and the road closes with the first serious snow
Alpine lake walks and high tundra, all at altitude. No guide needed; acclimatise first.
Arriving from sea level and walking a 3,600m pass on day one. Altitude sickness is a common problem for the rangers, and it does not care how fit you are.
July above all, then June and August, plus the September elk rut at Moraine Park
Bear Lake and Sprague Lake are flat, short and give the full mountain view — but Bear Lake Road has its own timed-entry permit, separate from the one for the rest of the park. Anything higher is genuinely hard work at this altitude for small lungs.
Estes Park is the gateway and is busy and priced accordingly. Grand Lake on the western side is quieter and cheaper, and Lyons or Loveland put you an hour out for much less.
Trail Ridge Road closes with the first serious snow and reopens around Memorial Day.Jan · Feb · Mar · Apr · Nov · Dec
Kept out of the score on purpose. Averaging a rare catastrophe into a monthly number would tell you something false; the warning is the honest form.
Afternoon thunderstorms are near-daily in July and August and the tundra has no shelter at all — the local rule is to be below the treeline by noon. Timed entry runs all season, and Bear Lake Road takes its own permit, released monthly.
0 is this destination’s own quietest month and 100 its busiest. The scale never compares one destination to another. Source: NPS ROMO
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