Best Route from West Yellowstone Montana to Redwood Nat Park

If you have the time you might like a more northern route. Pick up 90 just north of the park. I have taken this route in late Sept. Nice rv park in Missoula, another in Couer d'Alene. Drop down to 84 to follow the scenic Columbia River Gorge. I made a side trip to Mt Saint Helens. Picked up coastal Rt 1 in Astoria, saw Ft Catslop, scenic Oregon coast, lots of camp grounds. Stayed on the Klamath River campground just north of the Redwoods NP.

It comes down to what you will see and be able to do going west on I-80 or I84. Less fuel and time on the road going to Reno and across to I-5 and then taking Hwy 20 west from Redding. More to see going through eastern Oregon and more places where I would want to stop along the way.

Going to Redwood National Park I would also go through Mendocino and Fort Bragg along the coast and inland on Hwy 101 I would go along the Avenue of the Giants and visit Ferndale and Eureka on my way north to Prairie Creek.

Ancient Redwoods RV in Redcrest, CA is an excellent place to base. You're right in the middle of the redwoods with many gentle, short trails to walk and things to explore. Have fun!

At the Redwood end, there are 2 reasonably easy routes to the coast, US199 from Grants Pass, OR, or CA20 to US101.

To take the southern route, I'd (as a first guess) take US20 to I15 to I80 to CA20 (west of Donners Pass).

For the northern route I'd consider US20 to Boise (or a combo of 20,15, I84). Then US20 across eastern Oregon to Bend, and then SE to Medford. There have been threads discussing alternative routes from Bend to Medford/Grants Pass.