We try to be flexible in planning a trip, because yes, forest fires, tropical storms, and floods have changed our intended routes. I think it was in late summer 2016, there were so many fires between Michigan and Portland OR, that we just headed for the Pacific Coast and drove north from N California, staying upwind from the smoke....
Not this season, but a few seasons back, the Cameron Peak fire (the largest ever in Colorado), changed our plans for the latter part of the season since it burned in and around several favourite USFS campgrounds, and routes. It was a massive fire and the burn scars are a permanent part of the landscape of the Poudre Canyon northwest of Fort Collins.
We had a reservation at a campground on the eastern plains of Colorado, around Fort Morgan, about 75 miles from the closest part of the fire. Even that far out, there was a very heavy, eerie smoke in the campground (at Jackson Lake SP). It was so ominous to experience that forest fire that far away.
A new respect of what mother nature can throw at you.
Since we retired 20 yrs ago we spend every Summer at our cottage. This has been the worst year ever. I poured rain at least three times a week. We had four power outages that last a few days. Three times we were driven back to the city due to thick wildfire smoke. Took the boat out twice. Summer's are short here so it's basically over.