In July 2020, I took a road trip to Yellowstone and Glacier National Parks. It was the best trip of my life — and it's the reason Grandeur Travel Planning exists at all. But if I'm being honest, it also taught me most of what's on this list the hard way, one wrong turn and one sold-out campground at a time.

National Parks trips have a way of looking simple on a map and turning complicated the moment you're actually standing in front of it, permit app open, cell service gone, three hours of driving still ahead of you. Here are the five mistakes I see most often — and the ones I made myself before I knew better.

1. Underestimating the Distances

On a map, Yellowstone and Glacier look like neighbors. In a car, they're the better part of a full day apart — and that's before you factor in the drive through Yellowstone itself, which can easily eat two or three hours on its own thanks to wildlife jams, road construction, and speed limits that exist for very good reason.

National Parks are enormous. What looks like "we'll just swing by that other overlook on the way" on Google Maps is often a 90-minute detour once you account for park roads, elevation changes, and the fact that you will stop for the bison. Everyone stops for the bison.

The fix: Plan driving time inside the park separately from driving time between parks, and pad both more than feels necessary.

2. Booking Lodging Too Late

Here's something that surprises a lot of first-time National Parks travelers: the good lodging inside or near popular parks can book up six months to a year in advance for peak season. I learned this the uncomfortable way, ending up in a motel that was a 45-minute drive from the park entrance — which meant every single day started and ended with an hour and a half I hadn't planned for.

The fix: If you know your dates, book lodging first, before you plan anything else. The itinerary can flex around your hotel. The hotel won't flex around your itinerary.

3. Not Accounting for Permits and Timed Entry

Several of the most popular parks and trails now require timed-entry permits, and some of the best backcountry experiences require permits that are gone within minutes of release. This isn't optional planning — it's the difference between hiking the trail you came for and standing at a trailhead reading a sign that says you needed a reservation.

The fix: Research permit requirements as early as you research flights. Some release dates are months out, and they don't wait for you to be ready.

4. Packing for the Wrong Weather

Mountain weather does not care what season it is where you live. I've stood in Glacier National Park in July, watching what started as a warm, sunny morning turn into sleet by early afternoon — at elevation, conditions can shift fast, and "it's summer" doesn't mean much once you're a few thousand feet up.

The fix: Layers, always. A trip built around one forecast is a trip built around bad luck.

5. Trying to See Everything

This is the mistake almost everyone makes at least once, myself included: cramming too many stops into too few days, turning what should be a memorable trip into a checklist you're racing against. The parks reward slowing down — the moments that actually stick with you are rarely the fifth overlook of the day.

The fix: Pick fewer things and give them more time. You can always go back. (I did.)

The Trip That Started It All

That July 2020 road trip is the reason I do this work now. I went in thinking I'd done my homework, and I still made most of the mistakes on this list. What I came home with wasn't just incredible memories of Yellowstone and Glacier — it was a genuine understanding of how much smoother the whole thing could have been with the right planning up front.

That's exactly what Grandeur Travel Planning exists to do. Whether you want a fully designed itinerary you book yourself, or the whole trip planned and booked for you, we build in the things this list is about — realistic drive times, lodging booked early, permits accounted for, and a pace that lets you actually enjoy where you are instead of rushing to the next stop.

Ready to plan a National Parks trip without learning these lessons the hard way? Book your free consultation and let's start mapping it out.