Last Updated: May 4, 2026
The Catalina Highway — officially the General Hitchcock Highway — climbs 27 miles from the Sonoran Desert north of Tucson, Arizona to the summit of Mount Lemmon at 9,159 feet, and it’s one of the most remarkable short drives in the American Southwest. In those 27 miles you pass through five distinct ecological life zones — from saguaro desert at the base through chaparral, oak woodland, pine-oak forest, and finally ponderosa pine and Douglas-fir near the top — with the temperature dropping roughly 20 to 30 degrees from the desert floor. The mountain was named for Sara Plummer Lemmon (1836–1923), a botanist who made the ascent in 1881 with her husband John Gill Lemmon while collecting plant specimens — reportedly the first woman to reach the summit. We drove up on a clear March morning, rising out of the desert bloom into cool, forested air, with snow still on the ground near the top. From 75°F in Tucson to a couple inches of fresh snow above Summerhaven in about an hour.
The Catalina Highway: A Sky Island Drive
The Santa Catalina Mountains are one of southern Arizona’s classic sky islands — isolated mountain ranges that rise so steeply from the surrounding desert that their summits support entirely different ecosystems, biological communities cut off from each other by miles of hot desert basin. The Catalinas rise from roughly 2,500 feet at Tucson’s edge to over 9,000 feet at Mount Lemmon, and the ecological change is dramatic: you start in saguaro and palo verde, push through manzanita and scrub oak, and emerge near the top into a landscape that looks and feels more like the Rocky Mountains than the Sonoran Desert. The pullouts on the way up frame increasingly dramatic views back over Tucson and the Avra Valley — the whole basin spread out below you, saguaro-dotted right to the base of the mountain.
Summerhaven
Summerhaven is the small community near the top of the mountain — a few dozen cabins, a handful of businesses, and a summer population of Tucsonans escaping the valley heat. It sits at around 7,500 feet, where summer temperatures rarely exceed the mid-70s on days that are hitting 115°F in the city below. The community was devastated by the 2003 Aspen Fire, which burned over 84,000 acres of the Catalinas and destroyed roughly half of Summerhaven’s structures. Rebuilding took years, and the community that exists now is noticeably smaller and newer than what longtime visitors remember. There’s a small general store, a couple of restaurants — including the popular Mt. Lemmon Cookie Cabin with its homemade cookies and pizza — and the authentic feel of a place that regenerated from genuine disaster and chose to stay.
We hiked a fire road for a while near Summerhaven — the snow was wet and firm underfoot, the pine forest was quiet, and the contrast between the snow on the ground and the warm March sun overhead was exactly the kind of small, unexpected pleasure that makes day trips like this worthwhile.
Just above Summerhaven, the road continues to the Mount Lemmon Ski Valley — at approximately 8,200 feet, the southernmost ski area in the continental United States. When snow cooperates, the runs are short but the novelty of skiing within an hour of the Sonoran Desert is genuinely unique. Ski Mount Lemmon was still open during our March visit but not on the day we were there — the season was winding down and more snow was in the forecast. It’s a small area by any standard, but that’s part of the charm.
The Mount Lemmon SkyCenter
At the very summit sits the Mount Lemmon SkyCenter, home to the observatory that the United States Air Force originally built in the 1950s as a tracking station — used to help monitor the Space Shuttle during operations at White Sands, New Mexico, among other missions. When the military relinquished the facility to the US Forest Service, the University of Arizona took over the telescopes, which are now used for both astronomical research and public education through the SkyCenter’s popular evening stargazing programs. Tucson’s strict dark-sky lighting ordinances — designed to protect Kitt Peak National Observatory, the Whipple Observatory on Mount Hopkins, and Mount Lemmon itself — make the night sky here extraordinary, and the public programs are among the most rewarding astronomical experiences available to casual visitors anywhere in the Southwest.
Arizona-Sonora Desert Museum: Spring in the Garden
After the Mount Lemmon drive we returned to our daily ritual at the Arizona-Sonora Desert Museum. When we’re in Tucson, Michael takes out a membership for the year and goes almost daily, which means we’ve watched the museum garden’s seasonal progression in real time across many visits and many years. Spring at the Desert Museum is a genuinely different experience than any other season — something new seems to open every morning, and the cactus gardens shift from week to week.
Parry’s penstemon was in full bloom — tall stalks of brilliant scarlet-red tubular flowers that attract hummingbirds from across the garden. Named for botanist Charles Christopher Parry, who collected extensively in the Southwest in the 1850s and 60s, it’s one of the most reliably striking spring wildflowers in the Tucson Mountains and a longtime favorite of Michael’s for desert photography. The spring was running a few weeks behind schedule this year, possibly because of a wetter and cooler winter, but everything was catching up quickly.
Desert globemallow — one of the most reliable late-season Sonoran Desert wildflowers, with its orange blooms persisting long after many others have faded — was seemingly everywhere. Other blooms coming on included tufted evening primrose, silverleaf nightshade, desert marigold, and brittlebush. The cactus species were just beginning to show their first color — the barrel and prickly pear would peak in April and May, and the saguaros wouldn’t hit full bloom until late May when Tucson temperatures start regularly hitting 100°F.
The spring bloom sequence at the Desert Museum is a reliable guide to what’s happening in the surrounding desert — and as a longtime member, Michael has tracked this sequence across many years and many visits. For a committed desert photographer, a spring membership is one of the better investments of the entire Tucson season.
Practical Tips for Mount Lemmon
Best time to visit: Year-round, with each season offering something different. Spring means wildflowers in the desert zones below and often snow at the summit. Summer is the most popular season — Tucsonans drive up to escape the valley heat and Summerhaven’s restaurants are busy. Fall brings excellent color. Winter can close the road with snow and ice. Check road conditions before driving: The Catalina Highway closes during and after heavy snowfall. Arizona DOT maintains current road conditions at az511.gov. Dress in layers: The 20-to-30-degree temperature drop from Tucson to the summit is consistent year-round. Even in spring, the summit is cold and the wind is real. Ski Mount Lemmon: The southernmost ski area in the continental US — a small area, but unique. Season typically runs December through March depending on snowfall; check current conditions before making the drive. Mount Lemmon SkyCenter: Public evening stargazing programs at the summit observatory are outstanding — reserve well in advance at skycenter.arizona.edu. Summerhaven dining: Mt. Lemmon Cookie Cabin is the landmark stop near the top. Photography: Pull-offs along the highway frame increasingly dramatic views of Tucson as you climb. Early morning light on the pine forest near the summit is exceptional. Combine with: The Catalina Highway trailhead near the base connects to the extensive Sabino Canyon trail system — an easy pairing for a full day in the Catalinas.
Frequently Asked Questions About Mount Lemmon
How far is Mount Lemmon from Tucson? The Catalina Highway begins at Tanque Verde Road on the northeast edge of Tucson, and the summit of Mount Lemmon is approximately 27 miles up the mountain — about an hour’s drive from the city, depending on how many stops you make along the way. The trailhead parking for most hikes is at pullouts along the highway.
What is special about Mount Lemmon? Mount Lemmon offers one of the most dramatic ecological transitions of any publicly accessible drive in North America — 27 miles that span the ecological equivalent of driving from the Mexican border to Canada in terms of habitat zones. The mountain supports five distinct life zones from Sonoran Desert to alpine forest, and the summit is home to the southernmost ski area in the continental United States.
Is there skiing at Mount Lemmon? Yes — Ski Mount Lemmon at approximately 8,200 feet is the southernmost ski resort in the continental United States. It’s a small area, but skiing within an hour of saguaro cactus is genuinely remarkable. Season typically runs December through March depending on snowfall; check current conditions before making the drive.
Who was Mount Lemmon named after? The mountain was named for Sara Plummer Lemmon (1836–1923), a botanist who made the first documented ascent by a woman in 1881 while collecting plant specimens with her husband John Gill Lemmon. The pair were prolific California and Southwest botanical collectors, and several plant species carry the Lemmon name.
Can you visit the observatory on Mount Lemmon? The Mount Lemmon SkyCenter offers public evening programs with access to the research telescopes, originally built by the US Air Force in the 1950s and now operated by the University of Arizona. Public stargazing programs must be reserved in advance at skycenter.arizona.edu. Tucson’s strict dark-sky lighting ordinances make these programs extraordinary — the night sky from 9,000 feet above the desert is genuinely spectacular.
Part of our spring 2024 Tucson exploration — pairs naturally with the Tucson Mountains on the west side and Sabino Canyon in the Santa Catalina foothills.
