Middle Carter via Zeta Pass

The Middle Carter via Zeta Pass is 11.4 miles round trip, starting at Nineteen-Mile Brook Trailhead (Route 16). At AMC book time — half the distance in hours plus 30 minutes per 1,000 ft of climbing — that works out to roughly 6-10 hours. Most parties take longer than book time on rough or above-treeline terrain, in winter, or with a heavy pack.

The Middle Carter via Zeta Pass climbs about 3,701 ft over 11.4 miles — an average of roughly 324 ft of gain per mile. That figure is cumulative ascent across the whole out-and-back, not the difference between the trailhead and the high point.

HikerNerd rates the Middle Carter via Zeta Pass Difficult, scored with the Shenandoah difficulty formula — √(elevation gain × 2 × distance) — applied to its 11.4 miles and 3,701 ft of gain. The score measures physical effort only. Above-treeline exposure, water crossings, and winter conditions can make a moderate-rated route the hardest day of your year, so check current conditions before committing.

The Middle Carter via Zeta Pass summits 2 named peaks: Middle Carter Mountain, South Carter Mountain.

The Middle Carter via Zeta Pass starts at Nineteen-Mile Brook Trailhead (Route 16). Check the trail alerts on this page before you drive — trailhead access and parking in the White Mountains change with closures and construction.