For snow-capped mountains and lush trails, head to the northern states.

Connecticut: Mount Frissell

A strenuous trail for advanced hikers only, Mt. Frisell is the highest point in the state if you can make it to the summit. Lush forest covers the entire mountain and obscures part of the view from the top, but you can still enjoy the fall colors, as there are some nice lookout points on the hike up. Once on the summit, leave your mark by signing the little diary fastened to a tree. This is an isolated area, so make sure you know what you're doing before attempting the hike –If you get lost or are hurt, help won't be around the corner. 

Delaware: Brandywine Creek State Park

Two-hundred-year-old tulip trees offer a magnificent introduction to trails laden with rich foliage. Short, steep trails are the common denominator here, and many follow creeks or come to an end over marshes. Canoeing and tubing are popular summer activities, and cross-country skiers take up to the trails in winter.

Idaho: Mount Borah

Primarily a climber’s mountain, the advanced hiker can still reach the top if willing to go through some daunting paths of loose rock and around steep vertical drop-offs. Not for the faint of heart, the 11,600-foot hike to the top can take a toll. Covered in snow year-round and prone to abrupt storms, Mt. Borah is a tricky hike. Go in July for the best chance to avoid severe weather. An open pine forest guides you on the way up, providing shade and plenty of opportunities for birdwatching. Snow crossings are frequent even in summer, and altitude sickness is usual when hiking up, so take precautions and bring plenty of water.

Illinois: Forest Glen Preserve

Over twenty five miles of trails, including a 1/3 mile handicapped trail, make for stunning wildlife spotting. Deer, coyotes, foxes and geese pack the area, and the preserve is a bird-watchers' paradise. The hike up calls for mushroom hunting (allowed in the preserve), and is rewarded by spectacular views from the 72-foot observation tower.