You're not packing for 'a hike.' You're packing for five completely different climates that all could happen at a national park. Smoky Mountains will sweat you out. Zion will bake you, then soak you. Grand Teton will frost your coffee. Grand Canyon will roast you by 10 am. Yellowstone will do all four seasons before lunch.
Here's what actually works, park by park, plus the basics that carry you no matter which trailhead you're standing at, fam.
The basics that work at every park
A few non-negotiables before we get park-specific: save your moisture-wicking pieces for the actual trail miles (cotton's great for camp and town, less great for anything involving a sweaty back). So make sure that you have a layer that you can tie around your waist or stuff in a tiny bag, because mountain weather has zero chill about changing its mind. And be sure to include sun protection you can actually keep on: a quarter-zip sunshade beats the sunscreen you were supposed to reapply an hour ago. Nail these and every park below just falls into place.
Great Smoky Mountains: humid, shaded, and thick with bugs
The Smokies are green for a reason: it's humid nearly year-round, and the tree coverage means less sun but more sweat. Skip the cotton tee that clings by mile two. A Summit Longline Bra under a breathable Modal Valley Tee handles the humidity, and a Hybrid Explorer Short keeps you cool on the climbs without the overheating a full pant brings; just plan on bug spray for the exposed skin. Save a Quarter Zip Sunshade for elevation — Clingmans Dome runs 10-15°F cooler than the valley.
Zion: dry heat, slot canyons, and water crossings
Zion's most famous hikes (The Narrows, Angels Landing) mix desert heat with actual river wading — which is exactly what our Canyons collection was built for. A Cut Back Crop doubles as a sports bra, so it works whether you're wading through The Narrows or just putting in dry miles; pair it with Mid Rise Bottoms for the water crossings, or a Hybrid Explorer Short if you're staying on dry trail the rest of the day. Either way, it dries fast and won't turn into dead weight in your pack. If your route includes The Narrows, plan on getting wet up to your knees or higher, and dress like it.
Grand Teton: alpine mornings, big peaks, and a collection built for exactly this
Grand Teton practically has a Nani collection named for its front door: the Jackson Collection was built in the shadow of these mountains. A Grand Teton Oversized Tee over a Longline Bra covers the basics, a Trekker Pant handles everything from the trailhead to dinner in town after, and a Basin Full Zip Fleece or Afton Colorblock Vest catches the cold mornings before the sun clears the range. If a swim in Jenny Lake or String Lake is on the itinerary, it's cold enough that you'll want your suit on under everything else, not packed at the bottom of your bag.
Grand Canyon: extreme heat, minimal shade
Below the rim, temperatures climb fast, and shade is rare. This is the one park on the list where sun protection matters more than warmth. A Camp Quarter Zip Sunshade goes on over anything breathable underneath, and it does more for you here than sunscreen alone, especially on longer routes like Bright Angel where there's no quick way back up.
Yellowstone: geothermal steam, alpine lakes, and four seasons in a day
Yellowstone will test your layering system: cold mornings, warm middays, sudden afternoon storms sometimes all before noon. A Clove Ruched Tee is a great base for that swing, a Summit Stretch Hike Pant moves with you from boardwalk overlooks to backcountry trail without complaint, and an Afton Colorblock Vest is the piece you'll actually keep reaching for; on before sunrise, off by mid-morning, back on the second a storm rolls in.
A packing list, if you'd rather skip straight to it
A moisture-wicking base layer, a quarter-zip or fleece you can tie on and off, quick-dry pieces for anywhere with water, and a swimsuit if there's any chance you'll find a lake, spring, or coastline worth jumping into. Match the mix to your park, not the other way around.
This whole list, basically built into one collection: the Jackson Collection was made in the shadow of the Tetons for exactly these trips.
Shop the Jackson Collection →National park outfits, quick answers
What's the most versatile bottom to pack?
A Hybrid Explorer Short or Trekker Pant. Both have real four-way stretch so they move with you on uneven terrain, and neither turns into dead weight if you end up wading through water.
What should I not wear hiking in a national park?
Cotton anything (it stays wet and cold once you sweat or cross water), brand-new unbroken-in shoes, and anything so restrictive you can't comfortably climb over a rock or duck under a branch.
Should I bring a swimsuit to a national park?
If your park has a lake, hot spring, or river (Yellowstone, Grand Teton's Jenny and String Lakes, and plenty of others), yes. Wearing it as a base layer under your hiking clothes means you're never caught without it when you find water worth jumping into.
What's the most versatile thing to pack for any national park?
A quarter-zip sunshade or a vest. Every park on this list can swing 15-20 degrees between morning and midday, and something you can tie around your waist or stuff in a small bag beats carrying a jacket you never end up wearing.
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