Warren and Waitsfield are on Route 100 between Killington and Waterbury. The nearest interstate access is from exit 10 (Waterbury) on I-89; drive south on Route 100 for 14 miles to Waitsfield.
The Mad River Valley Chamber of Commerce (tel. 800/828-4748 or 802/469-3409; www.madrivervalley.com) is at 4601 Main St. (Rte. 100) in the General Wait House, next to the elementary school. It's open daily from 9am to 5pm during summer, foliage season, and ski season; during slower times, expect more limited opening hours and days.