Yep!
Nearly 20 years ago (in late August) we met (I trailered, my wife flew) some relatives In Albuquerque, NM to do a group ride.
This was a slow, easy 2,000+ mile "loop" ride that I had planned, going in a "counter-clockwise" direction, heading north into CO, then looping to the west, the south through AZ and UT) then east back to Albuquerque.
My plan was to get through the Colorado mountain areas first in order to dodge rain or cooler temps in early September.

Well that plan went to **** when my wife insisted that we "reverse" my plans and go in a "clockwise" direction, heading west through Utah first

Things went well until we got a little behind schedule and having to ride in Colorado one night to get to our motel and had "much too close" encounter with some deer!
On the "last leg" of the trip (in early September) we were in Rocky Mountain National Park and the temps dropped when the rain started that soon turned to sleet! My concern was that it would turn to snow before we could get to lower elevations and thankfully we managed to get to drier roads and warmer temps.
All that I said to my wife was "now do you see why I wanted to go north first"?

Pretty much a great trip...with a few exceptions.
My cousins (from TN) had an extremely wet ride home from Albuquerque (via I-40) but I stayed perfectly dry (in my pickup) on my way back to Michigan.

 

From the Park web page:

What You Need

• May 24 through September 8 vehiclereservations are required for the west side of Going-to-the-Sun Road and North Fork from 6 am to 3 pm.

• July 1 through September 8 vehiclereservations are required for Many Glacier from 6 am to 3 pm.

• Visitors entering the park in a vehicle or on a motorcycle in one of these areas during these dates need two things: (1) A vehicle reservation OR service reservation and (2) Park Entrance Fee OR valid Park Pass (Annual, Senior, Military, etc.). See details for Entrance Fees and Passes below.

• The park is open 24/7 and visitors may enter vehicle reservation areas before 6 am or after 3 pm without a vehicle reservation. Learn more about visiting without a reservation.

You are correct if you ride OUT the West side, your screwed, turn around before then if you want to ride both directions

 

Someone may have mentioned already but depending on which entrance you take, you may need a vehicle reservation. Last year they were flexible. It was good for three days. This year, it may have changed to be single day. If you're coming from the east and taking the St. Mary entrance, no reservation needed. I wanted to mention because they sell out quick. We logged on last year the second they went on sale and almost didn't get one. The internet traffic was heavy and the site was crashing. They sold like 1,000 passes in 17 minutes.

Whenever/however you go........brace yourself. Glacier is one of the most beautiful places I've put my eyes on. If not maybe THE most beautiful.

 

insanity, and when we went in 2019 (before this governement "fix") didnt really see the need for special passes. the place is huge, if one place is full, move on to the next one.

 

We were there July 27th, 2021 and it was very crowded, even though you needed the "Reservation" to get in. It is a beautiful Park and if you're willing to do a few short hikes you can see even more amazing views. Avalanche Lake and Ptarmigan falls are a couple we've done more than once.

 

That’s why I think the best thing to do is turn around before you get to the exit gate on the west side

 

The need for reservations is especially annoying on a motorcycle when you want to try and be somewhat spontaneous and/or you run into adversity that causes delays. There have been a few national parks we've visited that required reservations. Ultimately, we had to buy a couple different reservations because we didn't know for sure when we'd get there. It sucks being bound to a schedule based on a reservation.

 

How many days and what type of lodging or camping?

It’s been decades since we were there. Camped on Lake MacDonald. It has a Marina and Stables. We rented a boat and fished.
My wife and Daughter hired a guide on horseback who took them far back into bear country.

Enter from Saint Marys. Ride the Sun Highway to the west side. Try getting a room at Lake MacDonald Lodge..But do not exit the park once you are in. Until you leave.

 

Like this? Wife and I riding 2 up on Pikes Peak caught in a snow/sleet storm. Around 10,000 ft elevation, the road was getting covered. Turned around very carefully and made it back down.

 

Riding Pikes Peak July 4th weekend 2019, a beautiful day that year, lol.