What to Pack for Rocky Mountain National Park

Layer a moisture-wicking base layer, an insulating mid-layer (fleece or light down), and a waterproof shell. Avoid cotton entirely — it holds moisture and causes hypothermia when wet. Sturdy trail shoes or hiking boots with ankle support are essential. Even in summer, bring a warm layer for above treeline where temperatures can drop 20°F from the trailhead.

Bear spray is not required but is recommended if you're hiking in backcountry areas. Black bears are present in RMNP, though encounters on popular trails are uncommon. More important is proper food storage — never leave food unattended, use bear boxes at campgrounds, and never store food in your tent.

Plan on at least 2 liters of water per person for a half-day hike, and 3 to 4 liters for a full day. Altitude increases dehydration — you lose more water through breathing at elevation than at sea level. A water filter or purification tablets allow you to refill from streams if needed on longer hikes.

Estes Park sits at approximately 7,522 feet above sea level. The park's visitor centers are around 8,000 to 9,000 feet. Trail Ridge Road reaches 12,183 feet at its highest point. If you're coming from sea level, plan an easy first day — headaches, fatigue, and shortness of breath are common at altitude. Drink extra water and avoid alcohol on your first night.

Dogs are allowed in RMNP but with significant restrictions. They are permitted on paved roads, in parking lots, at campgrounds, and on two specific trails (the Riverwalk in Horseshoe Park and the Sprague Lake path). Dogs are not permitted on any other trails, in the backcountry, or in any buildings. Dogs must be on a leash no longer than 6 feet at all times.

For a day trip: layers (base, mid, shell), sturdy footwear, 2 to 3 liters of water per person, high-energy snacks, sunscreen (SPF 50+ at altitude), sunglasses, a hat with a brim, a small first aid kit, and a fully charged phone with offline maps downloaded. A small daypack (20 to 25 liters) is ideal for carrying everything comfortably.

Yes — more than most visitors expect. At 10,000 to 12,000 feet, UV radiation is significantly stronger than at sea level. You can burn in under 20 minutes on the alpine tundra even on a cool, overcast day. Use SPF 50 or higher, reapply every 90 minutes, and don't forget your lips, ears, and the back of your neck.