Arrowhead Mountain stands just east of Stevens pass, and is accessed easily from Highway 2. Arrowhead is a popular objective for backcountry skiers, snowboarders, and snowshoers alike, providing gladed slopes and over 3100 feet of vertical from top to bottom. On any given weekend in the winter, you're likely to find many a happy skier/rider on the mountains summit, taking in the views and ripping the skins before diving into waist-deep powder on the NW slopes.
This peak was named by former Forest Supervisor A. H. Sylvester. The name referrs to an arrowhead-shaped rock slide area on the south slopes (source).
Take U.S. Highway 2 East from the Seattle area towards Stevens Pass. Drive past the ski area approximately 6 miles to where the divided highway ends. Park in the pullout near the eastern portal Burlington Northern Santa Fe Railway Tunnel.
From the pullout, cross the highway and walk east along the highway for approximately 100 yards to a logging road. (Starting elevation: approximately 2900 feet.)
Ascend the logging road as it switchbacks through clearcuts until reaching a large clearing just west of the upper mountain. Skirt the top of the clearing, aiming for the "Arrowhead" rock outcrop on the W face. Routefinding from here is straightforward - just make your way up the gladed slope.
Before heading out, be sure to check out the Avalanche Report.
Local weather conditions are also available at the Stevens Pass Ski Area Web site.