Sunset Crater Volcano

Sunset Crater Volcano is the youngest of the roughly 600 volcanoes in the San Francisco Volcanic Field, and a short drive from Flagstaff gets you to a landscape that looks as if the eruption ended last week. Around the year 1085 the cinder cone erupted, burying the surrounding country in ash and sending lava flows across the valley below. Its red and orange rim, stained by iron and sulfur, glows at sunset, which gives the volcano its name. The monument protects the cone, a jumbled black lava field called the Bonito flow, and a smaller cinder cone, Lenox Crater, you can climb. A visitor center with exhibits and a short film explains the eruption and how it changed the lives of the people living nearby.

The signature walk is the Lava Flow Trail, a loop of about a mile through the Bonito flow, where twisted, jagged basalt, spatter cones and collapsed lava tubes make it feel like walking over the surface of another planet. Interpretive signs identify aa and pahoehoe lava, and the plants that have colonized the cracks. Because the cone itself is fragile, climbing the main crater has been off limits for decades, so you admire it from the trail and overlooks.

If you want to get to the top of a cinder cone, the Lenox Crater Trail is a short but steep climb of about a mile round trip, and it gives a good view of the surrounding fields and, on clear days, the San Francisco Peaks.

The eruption left a human story as well as a geological one. The ash blanket improved moisture retention in the soil, and archaeologists believe Sinagua farmers moved into the area afterward, which helps explain the pueblos at nearby Wupatki. The loop road that runs through the two monuments, about 34 miles from the highway north of Flagstaff and back, links the cinder cone with the red sandstone country of the Painted Desert.

It is one of the best half-day drives in northern Arizona, with pullouts and short trails along the way. Fall color on the aspens and oaks nearby, winter snow on the cinders and spring wildflowers all change the look from season to season.

Plan about an hour or two at Sunset Crater itself and half a day if you do the full loop with Wupatki. The elevation is over 6,000 feet and weather can shift fast, so bring layers, water and sun protection. The cinder surfaces are sharp, so wear sturdy shoes, and keep to the trails and respect the fragile crust.

Cell service is limited on the loop, so download maps ahead. Entry covers both Sunset Crater and Wupatki for a set period, so you can split the visit across a day. Services are minimal, so pack snacks, and be ready for a few miles of road with limited fuel stops.

Seasonal planning helps here. Summer days can be warm on the exposed cinders yet cool at altitude, and afternoon thunderstorms are common, so start early. Fall brings golden light and fewer crowds, and winter transforms the black cinders with snow, though the loop road may be affected by storms.

Spring winds can be strong. Bring a hat and sunglasses year round, because the dark rock reflects heat and the sun is intense at this elevation. Ranger programs, when offered, add context about the geology and about how people living nearby responded to the eruption, so check the schedule at the visitor center.