The Best National Parks to Visit in May — Ranked by Data
The best national parks to visit in May are Lake Clark, North Cascades, Katmai — ranked by a fixed formula over official NPS crowd data (2021–2025), NOAA weather normals and daylight, with seasonal closures counted against inaccessible parks.
Top 10 for May
| # | Park | Verdict | Score | Crowds vs peak | High/Low | Daylight |
|---|---|---|---|---|---|---|
| 1 | Lake Clark National Park | Best window | 96 | 7% | 59°F/39°F | 17.4h |
| 2 | North Cascades National Park | Best window | 96 | 11% | 69°F/44°F | 15.2h |
| 3 | Katmai National Park | Best window | 95 | 1% | 52°F/33°F | 16.8h |
| 4 | Gates of the Arctic National Park | Best window | 94 | 12% | 56°F/34°F | 20.1h |
| 5 | Wrangell–St. Elias National Park | Best window | 94 | 18% | 62°F/31°F | 17.5h |
| 6 | Isle Royale National Park | Best window | 92 | 17% | 58°F/37°F | 15.2h |
| 7 | Denali National Park | Best window | 87 | 28% | 54°F/33°F | 18.1h |
| 8 | Kenai Fjords National Park | Best window | 85 | 23% | 53°F/39°F | 17.1h |
| 9 | Rocky Mountain National Park | Best window | 85 | 40% | 61°F/35°F | 14.4h |
| 10 | Theodore Roosevelt National Park | Best window | 84 | 45% | 67°F/41°F | 15h |
Score = 45% weather comfort (NOAA 1991–2020 normals) + 35% quietness (NPS visitation 2021–2025) + 20% daylight, with penalties where headline access is typically closed. Identical formula for every park. Methodology.
Think twice in May
At the other end of the ranking: Lassen Volcanic (headline access typically closed), Glacier (headline access typically closed). Every park's page explains exactly why, with the underlying numbers.
All 63 parks in May
Lake Clark (96)North Cascades (96)Katmai (95)Gates of the Arctic (94)Wrangell–St. Elias (94)Isle Royale (92)Denali (87)Kenai Fjords (85)Rocky Mountain (85)Theodore Roosevelt (84)Grand Teton (83)Badlands (81)Crater Lake (81)Acadia (79)Gateway Arch (78)Great Basin (78)Big Bend (77)Guadalupe Mountains (77)Mesa Verde (77)Mount Rainier (77)Voyageurs (77)Sequoia (76)Wind Cave (76)Shenandoah (75)Yellowstone (74)Black Canyon of the Gunnison (73)Indiana Dunes (73)Kings Canyon (73)Yosemite (73)Channel Islands (72)Olympic (72)Saguaro (72)Great Sand Dunes (71)Kobuk Valley (71)Redwood (71)Carlsbad Caverns (70)Bryce Canyon (67)Joshua Tree (67)Mammoth Cave (67)Petrified Forest (66)Cuyahoga Valley (65)Grand Canyon (65)New River Gorge (65)Pinnacles (65)White Sands (64)Arches (63)Canyonlands (63)Capitol Reef (63)Glacier (63)Glacier Bay (63)Haleakalā (61)Hot Springs (61)Lassen Volcanic (61)Zion (61)Great Smoky Mountains (59)American Samoa (58)Virgin Islands (58)Congaree (55)Dry Tortugas (55)Death Valley (54)Everglades (53)Hawaiʻi Volcanoes (53)Biscayne (45)
Last verified 2026-07-16