ROCKY MOUNTAIN PACKING CHECKLIST

Pack for a high-elevation alpine climate with big temperature swings: plenty of water, sunscreen SPF 50+, a warm mid-layer even in summer, sturdy waterproof hiking boots, moisture-wicking layers, a packable rain jacket, trail snacks, and a headlamp for early starts. Add a backcountry permit if camping overnight, and plan to be off exposed terrain by early afternoon. Use the interactive checklist above to tailor the list to your season.

In summer, wear moisture-wicking layers plus a warm mid-layer for above-treeline sections, a wide-brim hat, and polarized sunglasses, and carry extra water and electrolytes — dehydration compounds altitude effects. Start hikes at dawn, since afternoon thunderstorms build almost daily and lightning above treeline is a serious hazard.

There's no special gear required, but plan for the effects: drink more water than usual, pace yourself on your first day, and consider a lower-elevation acclimatization day before attempting a high-altitude hike like Longs Peak. Watch for headache, nausea, or shortness of breath, and descend if symptoms appear.

Winter visits call for a heavy insulated jacket, a warm hat and gloves, waterproof boots, and microspikes or snowshoes for icy trails. Add hand and toe warmers and trekking poles for stability. Remember that Trail Ridge Road is closed in winter, so plan your trip around the Estes Park side only.