Booked a 10 day trip through the Rockies and Glacier NP for mid July . Have 3 days before I can cancel and reading about fires this early in season is making me very concerned. Expensive trip . Any thoughts about whether we should cancel ?

You'll have to monitor smoke reports or smoke maps for the province of Alberta (where Banff National Park and Jasper National Park) is. But Alberta is a vast province and while there is smoke and wildfires in some areas, other areas aren't impacted.

Also, having lived in an area impacted by wildfires in the past, smoke changes hourly depending on the wind, and wildfire conditions can change rapidly day to day. And sometimes wildfires happening thousands of miles away can blow in. And other times, you can be 50 miles away from a wildfire, but if the wind is blowing the smoke in the other direction, you wouldn't even know. So what's happening today is irrelevant to what might happen tomorrow.

Saying that, have you looked at any webcams for Lake Louise or Banff or Jasper? Check the webcams - right now you'd never know there were wildfires hundreds of miles away:

https://www.banfflakelouise.com/weather-webcams
https://fairmont.roundshot.com/banff-springs/#/
https://www.skilouise.com/mountain-cam/
https://www.banffjaspercollection.co...ip/webcams/#/0

Closer to the wildfires is Jasper. Again, you'd never know there were wildfires based on the blue skies in Jasper right now:
https://www.jasperskytram.com/plan-y...ms-conditions/
https://www.windy.com/-Webcams/Canad...09,5,m:e6YacSm

Otherwise, until we as a global society stop adding more C02 into the atmosphere, the reality is that fires will continue happening earlier and earlier and possibly year-round. Not to be a downer, but things will continue to get worse and more unpredictable every year. I'm not hopeful things are never going to return to normal and I don't think you can ever fully predict where there will and won't be smoke anymore. Personally, I'd just move ahead and go on the trip and accept we live in an unpredictable world these days.

We will go ahead and hope for the best