Warm, sunny days, starry nights. Welcome to summer in the mountains of the North Cascades! Hiking trails in the Valley and foothills are open by June, and most of the high country trails are accessible by July. Mountain lakes are teeming with fish, mountain biking is in full swing, as are horseback riding, trail running, road cycling, rock climbing, swimming and boating. You might have to work at it, but if you try really hard, you may be able to fit it all in over the course of your vacation!