Best National Parks to Visit in May: 7 Top Picks

The best national parks to visit in May are Yosemite, where waterfalls hit peak flow; Great Smoky Mountains, peaking with spring wildflowers; Zion and Bryce Canyon before summer heat; Arches and Canyonlands in their comfortable shoulder window; Sequoia and Kings Canyon; and Pinnacles. Skip Glacier and Rocky Mountain's high country, where roads stay snowbound.

May is my favorite month to send hikers out the door. The desert hasn't turned into a furnace yet, the Sierra is melting in spectacular fashion, and the Appalachian forest is exploding with green. But "May" is doing a lot of work across a country this big, so let me be specific about where it actually pays off, and where you'll waste a trip standing in front of a closed gate.

Yosemite National Park, California

If you go to one park in May, make it Yosemite. This is the month the waterfalls roar. Snowmelt from the Sierra peaks in mid-to-late May, and Yosemite Falls, Bridalveil, and Vernal and Nevada Falls are at their loudest and fullest of the entire year. By August many of these are a trickle, so the timing genuinely matters.

Valley temps run a pleasant mid-70s daytime, dropping to the 40s at night. Tioga Road (the high crossing to the east side) is almost always still closed in May, usually not opening until late May at the earliest and often well into June, so don't plan a Tuolumne Meadows trip yet. The Valley, though, is wide open. Signature hike: the Mist Trail to Vernal and Nevada Falls, about 5.4 miles round trip to the top of Nevada (going up the Mist Trail and down the John Muir Trail), with the lower Vernal Fall turnaround at roughly 2.4 miles round trip. Wear a rain shell; in May "Mist Trail" is an understatement, you will get soaked. Reservations may be required to drive in on peak weekends, so check the park site before you go.

Great Smoky Mountains National Park, Tennessee/North Carolina

The Smokies are nicknamed the "Wildflower National Park," and early-to-mid May is when the spring ephemeral bloom is in full swing at mid elevations, trillium, lady slipper orchids, and flame azalea starting to color the slopes. It's also lush, green, and far less crowded than the October leaf-peeping crush.

Expect daytime highs in the low 70s in the lowlands, cooler and wetter up high, this is a temperate rainforest, so pack rain gear. The famous synchronous firefly event in Elkmont typically falls late May into early June and runs on a lottery system; if that's your goal, enter early. Signature hike: Alum Cave Trail toward Mount LeConte, about 4.6 miles round trip to Alum Cave Bluffs, or push the full 11 miles round trip to the LeConte summit if you're fit. Lower-elevation creekside trails like Laurel Falls (2.6 miles round trip) are best for wildflowers.

Zion National Park, Utah

May is the comfortable window before Zion's brutal summer. Highs sit in the low-to-mid 80s rather than the 100-plus you'll fight in July. The Virgin River is still running with spring melt, which matters for one hike in particular. The park shuttle is running its full schedule, so the scenic drive is car-free and easy.

One honest caveat: the Narrows. In May the river is often still high and cold from snowmelt, and the park closes the bottom-up Narrows to hikers when flow exceeds about 150 cfs, so check the current cfs reading before you commit. Signature hike: Angels Landing, about 5.4 miles round trip (you'll need a permit via the lottery for the chained final section). If the Narrows is open and flow is reasonable, the bottom-up wade is unforgettable, but go prepared for cold water and rent a drysuit early-season.

Bryce Canyon National Park, Utah

Pair Bryce with Zion, they're an easy two hours apart. Bryce sits high, around 8,000 to 9,000 feet on the rim, so May is when it finally shakes off winter. Expect highs in the 60s and nights that can still dip below freezing early in the month, so this is a layers park. The hoodoos with a dusting of late snow are stunning, and the famous dark skies are excellent.

By mid-May most trails are clear, though shaded switchbacks can hold ice early on, microspikes aren't a bad idea for the first couple weeks. Signature hike: the Navajo Loop combined with the Queen's Garden Trail, about 2.9 miles, the best short hike in the park, dropping you right down among the hoodoos via Wall Street (note that the Wall Street side can stay closed in early spring, so be ready to descend the Two Bridges side instead).

Arches and Canyonlands National Parks, Utah

I'm grouping these because they share a basecamp in Moab and the same seasonal logic. May is the last truly pleasant month before the heat arrives, highs in the upper 70s to mid-80s, which is exactly right for slickrock hiking. Come July, this country regularly tops 100 degrees and midday hiking becomes genuinely dangerous. May lets you actually enjoy it.

Arches now requires a timed-entry reservation during peak season (typically spring through fall), so book your entry window in advance. Signature hike at Arches: Delicate Arch, about 3 miles round trip with no shade, go at sunrise or sunset. At Canyonlands: the Mesa Arch loop is a quick half mile, but for a real outing do the Grand View Point trail along the Island in the Sky rim, about 2 miles round trip, for canyon views that rival the Grand Canyon with a fraction of the crowds.

Sequoia and Kings Canyon National Parks, California

May is a strategic month here: go low, not high. The foothills and the Giant Forest are accessible, and the Generals Highway is typically open, but high-country trails and the Mineral King road usually remain snowed in until later in spring or summer. So set expectations, this is a giant-trees-and-foothills trip in May, not a backcountry one.

Foothill temps are pleasant in the 70s; the Giant Forest at around 6,500 feet is cooler and may still see patchy snow early in the month. Signature hike: the Congress Trail loop from the General Sherman Tree, about 2.7 miles, a flat, jaw-dropping walk through the largest trees on earth. Check road status before driving up, as chain requirements can linger after late-spring storms.

Pinnacles National Park, California

An underrated May pick. Pinnacles bakes in summer, but spring is its window, wildflowers are out, the talus caves are accessible (when not closed for bat protection), and you've got a real chance of spotting a California condor soaring overhead. Highs in May land in the comfortable 70s to low 80s.

Signature hike: the High Peaks to Bear Gulch Cave loop, roughly 5.3 miles, with steep, exposed sections of carved steps and railings near the top, this is the one that delivers the condors and the views. Bring a headlamp for the cave section, and verify cave status on the park site, as the Bear Gulch and Balconies caves close seasonally for bats.

Skip these in May

Be honest with yourself about the high country. Glacier National Park's Going-to-the-Sun Road is almost never fully open in May, plowing typically finishes late June or July, so you'll see only the lowest sections and a lot of closed gates. Rocky Mountain National Park's Trail Ridge Road is likewise still snowbound and usually doesn't open until Memorial Day weekend at the earliest, often later. Yellowstone is opening up but many interior roads and higher trails are still snow-covered and muddy in early May. And Death Valley, while spectacular in spring wildflower years, is already pushing dangerous heat by late May, with highs commonly over 100 degrees, that's a March park, not a May one. Save these for high summer when they're actually at their best.

The through-line for May: chase the desert before it cooks and the snowmelt while it's roaring, and leave the alpine roads for July. Plan your entry reservations early for Yosemite, Arches, and Zion's Angels Landing, and you'll have one of the best hiking months of the year.