WetEV wrote:I wouldn't do it.
I should add, there is currently one place to stop in Idaho Springs, with two L2 charging cables from one Chargepoint station. Some of these Chargepoint stations are 6.6kW shared: meaning you get 3.3kW if someone else is charging. What if you get there, and need to wait a few hours for someone else? It's not too bad to stop for an hour and have Beau Jo's pizza and relax a little. But waiting for someone else to finish or worse wouldn't be fun. The good news is that getting home isn't a big problem if you can't get a charge, if nothing else follow old US 6 down the canyon. Slow and lots of curves and about 3kWh later, you will be in Golden, with multiple charge options.
Also, there are two possible stops before Vail pass, at the Whole Foods in Fresno with two charging cables, and at Copper Mountain ski area part way up the pass. One of the two cables at Fresno has been reported as not working for almost a year on Chargepoint's web page. I like to have two good options, and Fresno isn't quite to that standard.
There are not a lot of options in Fresno. For a pleasant adventure on a summer day, I'd go for it. If you need and don't get a charge at Idaho Springs, have a Beau Jo's Pizza and come home early. If you have enough charge to make Copper Mountain, and both Fresno and Copper Mountain stations look OK on Plugshare, then do the tunnel, get enough charge at one of the two locations if needed to make Vail, and get a full charge overnight. The return should be fairly easy in Summer, and only a little bit worrisome in winter..
I like to have multiple plans for trips like this. Good weather in summer, plan A would be just drive it. Plan B would be a stop in Idaho Springs if below the bail percentage. Plan C would be a stop in Fresno if below that bail percentage as well. and so on.
Wintertime, can not just drive it, will probably not work. So Wintertime Plan A would be drive to Idaho Springs, perhaps two hours to get above 95%, then drive the rest. Need a bailout percentage for Plan B/C, Fresno or Copper Mountain. If those don't look likely, perhaps Plan D, perhaps a stop in Breckenridge, CO. Adventure, not recommended.