Stoker and I are thinking about organizing a trip through Washington wine country, maybe next year. Probably end up being a group of 6-10 riders. Thinking, just for instance, of maybe Winthrop to Walla Walla. Would like plenty of good hard riding (nothing over the top here, say 50-75 mi/day, less than 5000 ft elev. gain/day), but with opportunity to do some wine tasting. Usual effort to avoid crappy roads, busy roads, dirt roads. Maybe 10-15 days duration? Probably with van support to haul suitcases from one lodging to the next. I'm generally familiar with the area, but am hoping to get recommendations for specific routing: roads to use and roads to avoid, places to stay, must-do restaurants, etc. If anybody has done this or something broadly similar, I'd love to get advice, routes/maps, web links, whatever you care to offer.
Thanks in advance.

Have a look at SIR's brevet routes, especially 600k and longer. They are never easy, but they are sweet.
https://www.seattlerando.org/index.ph...d=56&Itemid=39

Mountain riding in the Cascades is just marvelous. Don't miss what's called Old Blewitt Pass, FS Rd. 7320, paralleling SR 97 between SR 2 and I-90. Near Naches, Hwys 410, 123, and 12 make a magnificent loop. Locals argue about clockwise vs. counterclockwise.

Thanks Cfb, looks like there will be some useful info there.