Do you mean Yosemite or Yellowstone on the northern route??? Are your bikes bicycles or motorcycles??? Are you planning on visiting the parks or just a drive through? The thought of 150 miles/day on a bike gives me fanny fatigue, but I'm a geezer.

Are your bikes bicycles or motorcycles???

From the thread title and last year's posts, motorcycles.

Are you planning to go to Sturgis? If so, better get cracking on the reservations front... http://www.sturgis.com/

Where are you starting? You say Calif. or Nevada, but you might also consider starting in the Pacific NW and go over the Cascades or through the Columbia Gorge. If you started your ride in Portland or Seattle, you could see the Gorge, or take the North Cascades Highway over the mountains, then east on US 2 (or even better, the Transcanada highway through Banff/Jasper) before cutting down to Glacier, Yellowstone, (Sturgis) and the Black Hills.

Pushing it, you can go Seattle > Philly in 5 road days, so if you have 14 then you can zigzag around a bit and still get home in time.

Thank you both for your replies; still in the early stages, yes looking at both Yosemite and Yellowstone. We rode N.CA last year and averaged about 200 miles per day.
We had hoped to get to Yosemite, yet ran out of time. One of the riders had really hoped we could do it this year, yet it really does have us backtracking. As plans finalize we will see.
Your suggestion of the Columbia Gorge et al sounds great and I will present it to the group and also going the NCHwy. We may head near Sturgis but we aren't all about the rally, but the view/ride. We do know people who will have a house there if it is close to that time that we could do a night if desired.

The Badlands NP is right off I-90 and is a neat place to visit too. Yellowstone is awesome and if you can, do try for a ride through it. You also will be near Mt. Rushmore which could be included on your trip and doesn't take long to visit.

If it's about the scenic ride in the Black Hills, the route from Deadwood/Keystone/Custer would be much more relaxing than Sturgis (especially Iron Mt. Road/Custer Wildlife Loop). Spots to stop along the way to relax...SD Badlands east of Black Hills (about an hour out on I-90?) could be a daytrip loop thru them.

Ship the bikes to Las Vegas. Go into Death Valley through Pahrump. Take the Red Rock Canyon loop if you want to. Come out of Death Valley by way of Baker, CA. Just south of Barstow, take Hwy 58 over the Tehachipi Pass to Bakersfield. Highway 99 north to Fresno then Highway 41 to the south entrance to Yosemite. Turn right there to see the Mariposa Grove. Leaving the grove, continue through Wawona through the tunnel and your big view of the Valley. Leaving the Yosemite Valley by route 120 is your best bet. Check out Route 108 past Columns of the Giants and tie in to US 395 north.
Take 395 north all the way to Burns, Oregon. In Burns you can decide whether to take US 20 and go to Yellowstone or continue north on 395 all the way to Spokane, WA and US 2 east to Glacier NP. They are both beautiful National Parks, but I would not try to combine them in 1 trip after seeing so much of California. If you do go by way of Sturgis, make sure to see Devils Tower in the NE corner of Wyoming.

good for you midniteflyer...may be one of the most fun things you end up fulfilling on your bucket list. I have ridden in the saddle of my electraglide across every state out west...and do it over and over again at the end of every summer. I map the routes for our group...all scenic highways. I would suggest locking down a shipping destination. If you go a more southern city, then be sure to include Zion, Bryce Canyon, Arches, Moab as you head into Colorado moving east. Personally, I would prefer a more northerly route like i took last year. I would ship the bikes to Portland/Seattle and take off from there, hugging the Columbia River as you head east or crossing thru the middle of Washington State ( Leavenworth a pretty cool town to overnight) a little further north. Head into Idaho and cross the state west to east into Lolo Pass...gorgeous, scenic rides across Idaho...include Sawtooth if you want. At this juncture I would probably zig zag north to Glacier, crossing thru the park from west to east into St. Mary and then head south through Montana into Yellowstone either via Gardner entrance. Spend a couple of days in this area, maybe overnight in Cody and then keep heading east...badlands et al. Once you get past that point, the best riding will be behind you .....enjoy!! With 2 weeks...averaging 200-250 plus miles per day, you will have time to do it all.