Yellowstone National Park is not just the world’s first national park—it’s also home to more than half of the planet’s active geysers, including the legendary Old Faithful. With over two million acres of wilderness, boiling hot springs, and vast herds of bison and elk, a trip to Yellowstone demands thoughtful preparation. This guide covers everything from when to go and where to stay to the must-see geothermal wonders and crucial safety tips, so you can make the most of your journey into the geyser capital of the world.

Best Time to Visit

Yellowstone is open year-round, but each season offers a dramatically different experience. The most popular window is late spring through early fall (May through October), when the park’s roads and facilities are fully operational. Summer (June through August) brings the warmest weather, with daytime highs ranging from the 70s to low 80s Fahrenheit (21–27°C), but also the largest crowds. Visitors should expect long lines at entrances, full parking lots at major attractions, and limited lodging availability unless booked months in advance.

Spring (April to early June) and fall (September to October) offer a quieter experience with vibrant seasonal colors—wildflowers in spring, golden aspens in fall. Many lodges and services operate on reduced schedules during these shoulder seasons, but you’ll find shorter waits and a more intimate connection with the park’s geology and wildlife. Winter (November through March) is for the truly adventurous: most roads close to vehicles, but snowmobile and snowcoach tours provide access to steaming geysers in a frozen landscape. Temperatures often plunge below zero, so visitors must be equipped for extreme cold.

For the best balance of weather, accessibility, and crowds, plan your trip for late May, early June, or September. These months also offer prime wildlife viewing, especially in the Lamar and Hayden valleys, where bison, wolves, and grizzlies are often spotted.

Getting to Yellowstone

Yellowstone is vast, with five entrances located in Montana, Wyoming, and Idaho. The most convenient gateway airports are Bozeman Yellowstone International Airport (BZN) in Montana (north entrance), Jackson Hole Airport (JAC) in Wyoming (south entrance), and Yellowstone Regional Airport (COD) in Cody, Wyoming (east entrance). Car rentals are available at each airport, and driving is the primary way to explore the park.

  • North Entrance (Mammoth Hot Springs) – Year-round access via Gardiner, Montana. Closest to Mammoth Hot Springs and the Lamar Valley.
  • Northeast Entrance (Cooke City) – Open year-round. Leads directly to the Lamar Valley, often called America’s Serengeti for wildlife.
  • West Entrance (West Yellowstone, Montana) – Most popular summer entrance. Closest to Old Faithful, Midway Geyser Basin, and the Madison River.
  • South Entrance (Grand Teton National Park) – Open May to October. Connects Yellowstone to Grand Teton for a two-park itinerary.
  • East Entrance (Cody, Wyoming) – Open May to early November. Scenic drive approaching via the Wapiti Valley.

Distances within the park are deceptive: it can take two to three hours to drive between major attractions such as Old Faithful and Mammoth Hot Springs because of narrow, winding roads and wildlife jams. Always check the National Park Service Yellowstone Road Conditions page before departure, as construction and weather can cause closures.

Where to Stay

Accommodation options range from historic lodges to rustic campgrounds, and advance reservations are essential during peak season. Yellowstone National Park Lodges operates nine in-park lodges, including iconic properties like the Old Faithful Inn, Lake Yellowstone Hotel, and Mammoth Hot Springs Hotel. These fill up quickly—often a year in advance for summer dates.

Campgrounds are another popular choice. The park operates twelve campgrounds, including five that accept reservations (Bridge Bay, Canyon, Fishing Bridge RV Park, Grant Village, and Madison). Others are first-come, first-served, such as Mammoth and Tower Fall. Backcountry camping requires a permit and a solid understanding of bear safety and backcountry regulations.

Outside the park, nearby towns like West Yellowstone, Gardiner, Cooke City, and Cody provide additional lodging, dining, and services. Many visitors choose to base themselves in one of these gateway communities and drive into the park each day—though be prepared for long commutes during peak season.

Must-See Geysers and Hot Springs

Yellowstone’s geothermal features are the park’s main draw. Over 10,000 hydrothermal features—including geysers, hot springs, mud pots, and fumaroles—lie within its boundaries. Here are the ones you cannot miss.

Old Faithful Geyser

The most famous geyser in the world, Old Faithful erupts approximately every 60 to 110 minutes, shooting thousands of gallons of boiling water 100 to 180 feet into the air. Eruption duration and height vary, but the site’s predictability makes it a must-see. Visit the Old Faithful Visitor Education Center for predicted eruption times, then find a spot on the boardwalk or the old Inn’s porch. For a quieter view, hike the Observation Point Trail for a panoramic perspective.

Grand Prismatic Spring

Located in the Midway Geyser Basin, Grand Prismatic Spring is the largest hot spring in the United States and the third largest in the world. Its vivid rainbow-like colors come from microbial mats growing along the edges of the superheated water. The best view is from the Grand Prismatic Spring Overlook, a short hike up a hill off the Fairy Falls Trail. The spring’s steam and shifting light make early morning or late afternoon the optimal times for photography.

Norris Geyser Basin

The oldest and hottest thermal area in Yellowstone, Norris Geyser Basin features the Steamboat Geyser, the world’s tallest active geyser—eruptions can reach over 300 feet, though they are unpredictable. The basin is divided into two sections: the Porcelain Basin (barren, acidic, and colorful) and the Back Basin (wooded with many hot springs and geysers). Walk the boardwalks carefully, as the ground can be thin and scalding.

Mammoth Hot Springs

Near the north entrance, Mammoth Hot Springs is a terraced hillside of travertine deposits formed by hot water rising through limestone. The formations change constantly—what you see today may look different next year. Walk the Upper and Lower Terraces via boardwalks and the one-way driving loop. The nearby historic Fort Yellowstone offers a glimpse into early park management.

Other notable geothermal areas include the West Thumb Geyser Basin, set on the shores of Yellowstone Lake; the Fountain Paint Pot, with bubbling mud and steam vents; and the isolated Shoshone Geyser Basin, reachable only by a 14-mile hike. For a detailed guide, check the NPS geology page.

Planning Your Visit

Strategic planning can transform a chaotic trip into a smooth adventure. Follow these tips to maximize your time and safety.

Arrive Early or Stay Late

The park’s busiest times are between 10 a.m. and 3 p.m., especially at Old Faithful, Grand Prismatic, and the Grand Canyon of the Yellowstone. Arrive at trailheads or boardwalks by 8 a.m. to secure parking and enjoy the features without jostling through crowds. Evening light also provides stunning photography opportunities, and many animals become more active near dusk.

Stay on Designated Trails and Boardwalks

The ground around geothermal features is extremely fragile and perilous. In 2023, several visitors suffered severe burns after stepping off boardwalks into soft, thin-crusted terrain. Always remain on marked paths and boardwalks. The water in hot springs can be lethal—near boiling and highly acidic. Never touch the water or approach a geyser’s vent.

Wildlife Safety

Yellowstone is one of the best places in North America to see bison, elk, bears, wolves, and more—but all are wild and can be dangerous. Keep at least 100 yards away from bears and wolves, and 25 yards from bison, elk, and other large mammals. Bison injure more visitors than any other animal in the park. Use binoculars or telephoto lenses, not selfie sticks. If a bison lifts its tail, it is about to charge—back away immediately.

Carry bear spray (available at park stores) and know how to use it. Make noise on hiking trails, especially in dense forest or near berry patches. Never approach or feed any animal.

Packing Essentials

  • Layers – Temperatures can swing 30–40°F in a single day. A base layer, insulating mid-layer, and waterproof outer shell are recommended.
  • Sun protection – Sunscreen, hat, and sunglasses are essential even on cloudy days at high altitude.
  • Reusable water bottle – Fill up at visitor centers and lodges. Dehydration is common due to elevation and dry air.
  • Snacks and food – Dining options inside the park can be expensive and crowded; pack a lunch for flexibility.
  • First-aid kit and basic medications – Pharmacies are scarce within the park.
  • Charged phone and offline maps – Cell service is minimal; download the NPS app and offline maps before arrival.

Make Reservations in Advance

Accommodations inside the park and in gateway towns book out months ahead. If you plan to stay overnight, reserve lodging or campsites as soon as your dates are firm. Dining reservations at popular restaurants (like the Old Faithful Inn’s dining room) are also recommended. For day visitors, no reservations are needed for entry, but expect long lines at the gates, especially at the West and South entrances between 9 a.m. and noon.

Other Attractions Not to Miss

While geothermal features steal the spotlight, Yellowstone offers many other highlights. The Grand Canyon of the Yellowstone is a stunning 20-mile-long canyon carved by the Yellowstone River, with two magnificent waterfalls—the Upper and Lower Falls. Hiking trails such as the South Rim Trail and Brink of the Lower Falls provide dramatic viewpoints. The Lamar Valley, often called the Serengeti of North America, is the premier location for spotting wolves, grizzly bears, bison, and pronghorn. Early morning or late evening hours are best.

Yellowstone Lake is the largest high-altitude lake in North America, offering boating, fishing, and scenic cruises. The Fishing Bridge area is a good spot for birdwatching. For a quieter experience, explore the park’s more than 1,000 miles of hiking trails, ranging from the short, wheelchair-accessible Geyser Hill Loop to the multi-day Bechler River Trail in the park’s remote southwest corner.

Staying Informed and Safe

Conditions in Yellowstone can change rapidly. Always check the official NPS alerts page for updates on road closures, construction, wildfire smoke, and wildlife activity. Sign up for text alerts if available. Before setting out on a hike, leave your itinerary with someone at your lodging or at a visitor center.

Respect the park’s fragile ecosystems. Pack out all trash, avoid walking off trails, and never take any natural or cultural objects as souvenirs. Yellowstone is a national treasure that belongs to everyone—and its preservation depends on each visitor following Leave No Trace principles.

With thoughtful preparation and a spirit of adventure, a trip to Yellowstone rewards you with some of the most spectacular landscapes on Earth. Whether you come for the geysers, the wildlife, or the vast open spaces, the experience will stay with you long after you drive out of the park.