I found myself refreshing TripAdvisor’s Yellowstone forum for the third time that day. It was late April, and I was scrambling to book accommodation inside Yellowstone National Park for the July Fourth weekend, peak season. Lodging typically sells out 10 to 12 months in advance. I was nine months too late.

Having visited 109 countries, I turned to one of my go-to strategies: checking forums. Then I saw it. Someone posted they had to cancel their reservation for our exact dates. I immediately opened the hotel’s booking page in a new tab. The room was there, released back into inventory just minutes earlier.

By the time I finished booking, we had locked in what most travelers consider impossible to get.

This forum-monitoring approach is just one way to find accommodation that exists if you are willing to think outside the box. Inventory constantly shifts as people change plans. The key is knowing where to look when mainstream booking sites come up empty.

Whether you’re finalizing August travel or planning for next summer, these tricks can uncover options that others miss.