Snoqualmie plus blewett pass seattle to Wenatchee?

I haven't done it from Seattle. Should be pretty safe, but the good thing is there are several Chademo's along the way (North Bend, Snoqualmie Pass, Cle Elum, Leavenworth, Wenatchee) - so should you ever run low in heavy snow/rain/wind there's always an option for a fast recharge. The Chademo adapter certainly would seem like a good investment for you if you do this frequently.

We drive this route both ways. Latest was Saturday 19 December. Because we have the CHAdeMO adapter and an Aerovironment subscription we usually charge for a few minutes at the Snoqualmie summit. We live 30 miles north of Wenatchee so the extra RMs are a safety. We have found the NAV system to be pretty accurate and rely on it. Weather on Blewett Pass was pretty bad so last Saturday we used the SC at Ellensburg while we had a pretty good meal at the Bar 14 Ranch House. We then drove I-90 to George and then north to Wenatchee.

There's a friendly couple that host a lovely B&B about 6 or 7 miles W. of Wenatchee . . . Warm Springs Inn on Hwy 2. They're a Tesla destination point, and I'm sure they'd be very amenable to your dropping by to charge up.