(For anyone parsing that garbled age range in the headline: we're talking 5- to 10-year-olds, the sweet spot where kids are old enough to follow basic trail rules but young enough to still think a mountain marmot is the coolest thing they've ever seen.)
Last summer, I dragged my 6- and 8-year-old on the first 20 miles of a planned Colorado Trail segment, and by mile 12 I was one snapped granola bar away from quitting family hikes forever. My youngest was sobbing because his socks were damp from a creek crossing, my oldest was begging to turn back for ice cream, and I was pretty sure I was developing an altitude headache of my own. We made it to the campsite that night, and a year later we just finished our first 3-day high-altitude thru-hike segment with zero full meltdowns. The difference wasn't that my kids were suddenly "better hikers" --- it was that I stopped planning adult thru-hikes and started planning hikes for kids who think 4 miles is a very long way to walk to see a rock.
Redefine "Thru-Hike" Before You Book A Single Permit
The biggest mistake I made on that first failed trip was trying to stick to a 15-mile-a-day adult thru-hike itinerary. Kids don't care about mileage goals, and at high altitude, their bodies adjust far slower than yours do. For your first high-altitude trip with kids this age, forget "thru-hike" as a distance metric --- frame it as a continuous stretch of trail you can complete without everyone hating each other by the end. Stick to 3-5 max miles per day for your first trip, with zero required elevation gain over 1,000 feet in a single day. Prioritize trails with established, maintained infrastructure: no bushwhacking, marked campsites every 2-3 miles, reliable water sources, and ideally a ranger station within a day's walk. We tested our skills on the lower, 7,000-9,000 foot section of the John Muir Trail first, where campsites are spaced perfectly for short days and there's no scrambling required. And always, always do a day test hike at 8,000+ feet a month before your trip to check for altitude sensitivity: if your kid gets a headache or throws up at 8k, don't plan to go above 10k for your first multi-day trip.
Pack For Kid-Specific High-Altitude Chaos, Not Just Your Own Gear List
Adult thru-hikers can grumble through cold hands or a scratchy wool layer, but a 6-year-old who can't zip their own coat because their fingers are numb is a hiking trip-ending disaster. Skip the fancy ultralight gear for your first kid-focused trip and prioritize comfort and ease of use:
- Waterproof, broken-in insulated boots and mittens (not gloves --- small fingers struggle to wiggle into tight glove openings when they're cold) are non-negotiable. Pack at least 2 extra pairs of wool socks per kid, because damp feet at 9,000 feet ruin everyone's day.
- High-altitude weather changes fast, even in mid-summer: the temperature can drop 30 degrees in an hour, and afternoon thunderstorms are common. Pack an extra puffy jacket and base layer for each kid, even if the forecast says 70 degrees and sunny. We got caught in a surprise hailstorm at 10,000 feet on our first trip, and the extra puffy I stuffed in the top of my pack was the only reason my youngest didn't spend the rest of the hike shivering.
- Altitude messes with kid appetites, and they burn far more calories hiking at elevation than you do. Pack 2x the amount of their favorite snacks you think you need: freeze-dried ice cream, fruit snacks, pretzels, their go-to sandwich filling, even the weird sour gummy vitamins they beg for at the grocery store. We once ran out of our oldest's favorite cheese sticks by mile 3 of a 4-mile day, and the meltdown that followed could have been heard 2 miles away.
- Skip the fancy portable toilet if your kids are under 7 and uncomfortable using wag bags: a small, portable potty with disposable bags is worth the extra 2 pounds in your pack. Trying to talk a 5-year-old into squatting behind a bush at 9,000 feet is a lose-lose for everyone.
Build In "Non-Hike" Time Every Single Day (No Exceptions)
Adult thru-hikers can grind through 6 hours of hiking to hit a mileage goal, but kids need to stop every 45 minutes to throw rocks in a creek, chase a pika, or build a tiny snowman out of July snow patches. If you stick to a rigid schedule, you will have meltdowns, full stop. Plan for 1-2 hours of unstructured exploration time in every day's itinerary. If your goal is 4 miles, plan for 2 hours of hiking, 1 hour of exploring, 1 hour of lunch and rest. Tie the exploration to high-altitude-specific quirks to keep them engaged: challenge them to find as many different wildflowers as they can, or spot 3 marmots before lunch, or collect pinecones that only grow above 8,000 feet. We keep a small "high-altitude bingo" card for each trip with pictures of local flora and fauna, and a full row gets an extra 10 minutes of s'mores at the campfire that night. Also, skip the post-hike "reward" of getting to the car quickly: build in campfire time, s'mores, or a story time every night. Kids will remember the s'mores and the time they saw a marmot steal a granola bar way more than the 4 miles they hiked that day.
Teach Skills In The Moment, Not As A Pre-Trip Lecture
Don't sit your kids down the night before your trip and give a 30-minute lecture on Leave No Trace and altitude sickness. They'll tune out after 2 minutes. Teach skills in the context of what they're experiencing, tied to a "why" they care about:
- When your 7-year-old complains their head hurts, say: "That's an altitude headache! Let's sit down, drink some water, and eat a salty pretzel, and it'll go away in 20 minutes. Next time we hike up a big climb, we'll drink water every 10 minutes so it doesn't happen." (Pro tip: kids often can't articulate altitude sickness symptoms, so sudden crankiness, lethargy, or refusal to eat are all signs to stop, rest, and hydrate immediately.)
- When you pick up a piece of trash on the trail, say: "Let's grab this wrapper so the marmots don't eat it and get sick --- remember that sick squirrel we saw at the park last month?"
- Let them take on small, meaningful responsibilities so they feel like part of the trip, not a passenger: the 5-year-old can hold the map (even if they can't read it, they love the "important job" of it), the 8-year-old can check everyone's water bottles every hour, the 10-year-old can help filter water for the group. When they feel like they're contributing, they're far less likely to complain about the hike.
Have A "Meltdown Protocol" In Place Before You Leave
Let's be real: even the most perfectly planned high-altitude hike with kids will have at least one meltdown. It might be because their socks are wet, because they saw a bug, or because they're just cranky from the altitude. Have a pre-planned, no-thought-required protocol so you don't have to make decisions when you're already stressed:
- Stop hiking immediately. No pushing through to hit a mileage goal.
- Sit down, hand them a snack, and give them a 10-minute hug break.
- If they're cold, put on the extra layers you stuffed in the top of your pack.
- If they're still upset after 10 minutes, pull out your "emergency treat" --- a bag of their favorite candy, a small toy you saved for the trip, whatever works. And don't be afraid to turn around. We turned around 2 miles short of our first planned high-altitude campsite because my youngest had a pounding headache and was crying nonstop. We camped at a lower elevation that night, hiked the rest of the segment the next day, and my kids still talk about how "we almost made it to the top" like it was a huge adventure. No one remembers the 2 miles you didn't hike, but everyone remembers the day you forced them to keep going when they were miserable.
At the end of the day, the goal of a high-altitude thru-hike with kids this age isn't to log 50 miles or check a National Park off your bucket list. It's to build a memory of being outside, laughing, and feeling capable, so that when they're 27, they text you asking to plan a thru-hike together. If you lose your sanity a little along the way? That's just part of the story you'll tell later over s'mores.