"Can I ride my bicycle on the Going-to-the Sun Road?
Yes, but there are some exceptions. From June 15 through Labor Day, the following sections of the Going-to-the-Sun Road are closed to bicycle use between 11a.m. and 4 p.m.:
* From Apgar turnoff (at the south end of Lake McDonald) to Sprague Creek Campground
* Eastbound from Logan Creek to Logan Pass.
Due to ongoing road rehabilitation on the Going-to-the-Sun Road, portions of the roadbed may not be paved. Bicyclists should use caution riding on gravel portions of the road."