First Time JMT Mistakes

Most first-time JMT mistakes aren’t dramatic. They’re small decisions that feel fine at trailhead and slowly compound over a few days.

Here’s what actually tends to matter.

When you make it to the top of Muir Pass you'll get to read the atrocities in this book

1. Packing for uncertainty instead of reality

A lot of first-timers bring gear for every possible scenario instead of the conditions they’ll almost certainly face.

The result is usually extra weight that never gets used, especially in clothing and “backup” systems.

What to do instead:
Build your kit around repeatable conditions, not edge cases. You’ll deal with cold mornings, hot afternoons, and wet gear at some point — but you don’t need three separate solutions for each.

If something doesn’t get used on a normal training overnight, it probably won’t earn its place on the JMT.

2. Underestimating sun exposure

People expect sunburn in the desert. They don’t expect it at 11,000 feet with a breeze.

But elevation + reflection off granite + long exposure = cumulative burn even when it doesn’t feel hot.

What to do instead:
Treat sun protection like hydration — not optional, not situational. Regular sunscreen re-application, an real hat, and clothing coverage matter more than most people expect. Check out the new Patagonia Capilene Sun Hoodie (UPF 40+).

If you feel the burn, you’re already behind.

3. Starting too fast in the first 2–3 days

The trail feels easy at the beginning, especially if you’re excited and fresh. That combination leads a lot of people to push mileage early.

The issue isn’t fitness — it’s that the JMT punishes early inefficiency later.

What to do instead:
Keep early days intentionally moderate. You’re not trying to “bank miles,” you’re trying to settle into a pace you can repeat for 2–3 weeks.

If day 3 feels like a sprint, day 8 usually pays for it.

4. Not respecting altitude variability

Altitude doesn’t hit everyone the same way, and it doesn’t stay consistent. You can feel fine one day and sluggish the next without obvious reason.

What to do instead:
Don’t make assumptions about your “normal pace” early on. Hydrate more than feels necessary, eat consistently, and pay attention to appetite changes or headaches.

If things feel off, slow down before you force it into something worse.

5. Overthinking food quantity and underthinking food quality

First-timers usually fall into one of two traps: carrying too much “insurance food” or underestimating how much appetite changes over time.

Both lead to inefficiency. Either weight you don’t need or calories you wish you had later.

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What to do instead:
Aim for simple, high-calorie, low-prep food you’re actually willing to eat when tired. The goal isn’t variety, it’s reliability.

If you wouldn’t happily eat it on a cold, long afternoon, it’s probably not ideal JMT food.

6. Treating gear as static instead of adjustable

Most people think of their pack as “set” for the whole trip. In reality, it changes as soon as you start using it.

What to do instead:
Expect to adjust constantly: shedding layers, redistributing weight, rethinking what stays accessible.

The best setups usually aren’t perfect at the start; they get refined over the first few days.

7. Expecting a normal sense of time and structure

The JMT doesn’t really follow a normal daily rhythm. Days are defined more by terrain, weather, and energy than by clocks.

What to do instead:
Plan loosely and adapt daily. Don’t anchor too hard to strict mileage or schedules. Flexibility is what keeps the trip comfortable instead of stressful.

8. Ignoring small discomforts early

Blisters, pressure points, mild fatigue — none of these feel serious at first.

But on a multi-week hike, small issues tend to scale if ignored.

What to do instead:
Fix small problems immediately. Stop early for adjustments. Change socks. Adjust straps. Don’t wait for discomfort to become “worth addressing.”

Final thought

Most first-time JMT mistakes come from trying to fully “solve” the trip before it starts.

It’s better to show up prepared, observant, and willing to adjust.

The people who have the best trips usually aren’t the ones who planned perfectly. They’re the ones who adapted quickly.