I did Boulder 140.6 last year. I arrived about two weeks before the race, first spending about 10 days in Winter Park at 9,100 feet. I trained at that altitude and by the end of my time there, my watch said I had acclimated to this elevation.

While I was in Winter Park, I wanted to know what it feels like to hit max at altitude, so did some testing in SBR of what hitting max feels like in thin air.

For instance, on the bike, you might have to go with a higher cadence easier gear than a lower cadence heavy gear in the altitude.

It’s not super bad hitting an altitude wall though, you just have to step back and go a little lighter.

I have heard to arrive 2 weeks before or 1-2 days before...

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https://www.strava.com/...tes/zachary_mckinney