Mount Lemmon: The 27-Mile Drive From Mexico to Canada

Mount Lemmon. The Catalina Highway. The mountain Tucson drives up when the city hits 105. This is not a summit you earn with a backpack and three days off work.

The road climbs 27 miles out of the Sonoran Desert and gains more than 6,000 feet. It starts in saguaro. It ends at 9,157 feet in conifer and aspen. Biologists have a line about it that sounds like marketing until you drive it: you cross the same five life zones you would cross going from the deserts of Mexico to the forests of Canada. Twenty-seven miles. Half a tank. You leave home in shorts and arrive somewhere that wants a jacket.

The peak also carries a woman's name, which almost no American mountain does. In 1881 a rancher named Emerson Stratton guided the botanists J.G. and Sara Plummer Lemmon to the top, and he was impressed enough with Sara to name the mountain for her that day. Her husband took credit for a lot of the plants she collected. She got the mountain.

Know before you go

Mount Lemmon tops out at 9,157 feet at the end of the Catalina Highway, about an hour northeast of downtown Tucson, and it is open year-round with no reservation and no permit. Developed recreation sites along the highway charge $8 per vehicle for a day pass or $10 for a week, and an America the Beautiful or Coronado National Forest annual pass covers it. The road is paved and fine for a passenger car, but it closes temporarily after snowstorms, and the gate above Mount Lemmon Ski Valley stays shut through winter, cutting off the summit day use area. Count on the top running 20 to 30 degrees cooler than the desert floor. That gap is the entire reason Tucson comes up here in July.

Quick facts

How do you get up Mount Lemmon, and what does it cost?

You drive, which is why this mountain sees more people in a weekend than most Arizona sky islands see in a season. From Tanque Verde Road, take the Catalina Highway northeast and keep going.

Do you need a reservation? No. You need $8 and somewhere to put it. Buy the day pass online before you leave town or pay on-site with cash or a check, because there is no card reader at a trailhead at 8,000 feet. An annual pass works instead, but it has to sit visible on the driver's side of the dash. Before any winter trip, call the Pima County Sheriff's road hotline at (520) 351-3351. It runs 24 hours.

One current wrinkle. As of 2026 a Forest Service order has Marshall Gulch under a reconstruction closure: the Arizona Trail, Marshall Gulch Trail #3, Aspen Trail #93 and Sunset Trail #90 are open to hikers Fridays, Saturdays, Sundays and federal holidays, and the whole area closes Monday through Thursday. Check the Coronado alerts page before you build a day around any of the four.

What is the drive actually like?

Better going up in the morning and better coming down at golden hour. On the climb the light hits the Catalina granite face-on. On the way down, Tucson spreads out below you and the basin turns copper.

Around 4,000 feet the cactus quits and you are in grassland and scrub oak. By 6,000 it is ponderosa pine, which smells like vanilla when the sun is on the bark. Past 8,000 you get Douglas fir and aspen, and in late October those aspens turn a yellow that has no business being an hour from a saguaro.

Stop at Windy Point Vista. Everyone does, and for once the crowd is right. Then keep going to Summerhaven, the village near the top, where the restaurants handle lunch and the fudge shop handles the drive home. Summerhaven is also where the harder history shows: the Aspen Fire took most of the village in 2003 and the Bighorn Fire burned across the range in 2020, so the snags you pass are recent, not scenery.

Which trails are worth your day?

Lemmon Rock Lookout Trail #12 is the biggest payoff for the least mileage. It drops off the summit area to a fire lookout on a cliff edge with a straight view down into Tucson. Going down is easy. Going back up is the actual hike, so save some legs.

Mount Lemmon Trail #5 and Meadow Trail #5A leave the summit day use area and stay gentle and shaded. Aspen Draw Trail #423 climbs out of Ski Valley through the aspens, and that is the fall color hike here. The summit day use area has vault toilets and no potable water, so carry your own.

Can I bring a dog?

Yes, and this is one of the best dog days in southern Arizona, because you can put an animal on shaded trail at 8,000 feet on a day when Tucson pavement would cook its paws. Dogs must be leashed at developed recreation sites, wilderness rules apply where trails cross into Pusch Ridge, and a long-standing bighorn sheep closure restricts dogs in parts of the range. Read the trailhead signs. The hazards up here are not heat. They are lightning, burned timber that drops limbs, and water that is not always where you expect it.

Bringing kids?

One of the easiest yes answers in the state. The drive is the attraction, the payoff is a picnic table under conifers, and every hard part is optional. Ski Valley runs its chairlift outside ski season from the 8,297-foot base: a 30-minute round trip, a real mountaintop view, not one step of climbing. Operating days move around, so check with the ski area first.

How do you stay safe up there?

Monsoon lightning first. July and August afternoons build fast, and a 9,157-foot ridge with a fire lookout on it is exactly where you do not want to be at 2 p.m. Hike early, be off exposed ground by noon. Then cold: people leave a 100-degree valley in a t-shirt and reach the top in a 55-degree wind, so throw a layer in the car every time, even in August.

Then fire. The Catalinas burn, and fire danger in the Coronado sits high for long stretches of the year. Restrictions can land between when you plan a trip and when you take it, so check the forest's alerts page before you think about a campfire or camp stove.

Mount Lemmon FAQs

How much does it cost to go up Mount Lemmon?
Driving the Catalina Highway is free. Stopping at developed recreation sites requires a day pass: $8 per vehicle, or $10 for a week. An America the Beautiful or Coronado National Forest annual pass covers it, displayed on the driver's side of the dashboard.

How long does it take to drive to the top of Mount Lemmon from Tucson?
About an hour each way from the east side of Tucson for the 27-mile climb, and then longer, because the pullouts are the point. Most people spend three to four hours round trip, and a full day if they hike or eat in Summerhaven.

Can you actually ski on Mount Lemmon?
Yes, in a normal winter. Mount Lemmon Ski Valley is the southernmost ski area in the continental United States, and its runs typically operate from mid-December into early April depending on snowfall. Snow years vary wildly, so confirm conditions with the ski area first.

Is the road to Mount Lemmon open in winter?
The Catalina Highway stays open year-round as far as Ski Valley, but it closes temporarily after snowstorms and can require snow tires or chains. The gate above Ski Valley closes for the winter, cutting off vehicle access to the summit day use area. Call (520) 351-3351 for conditions.

How much cooler is Mount Lemmon than Tucson?
Generally 20 to 30 degrees cooler at the top, which follows from the roughly 6,000 feet the highway gains. A 105-degree day in Tucson is a high-70s afternoon in Summerhaven. That gap is why the mountain gets busy on summer weekends.

Put it on the map

Mount Lemmon is one of the 60 destinations on the McSenderson Arizona Outdoor Adventure map, and one of the few you can knock out on a Tuesday afternoon. The other 59 are in the 60-stop Arizona bucket list. If this sells you on the Santa Catalinas, Sabino Canyon sits at the foot of the same mountain, and Mount Wrightson an hour south is the sky island you climb instead of drive.

Ryan Laboy — Co-founder, McSenderson. Single-digit handicap golfer and ten-year skier based in Flagstaff, Arizona. Researches and designs every McSenderson map. hello@mcsenderson.com