The 100-Mile Wilderness
The sign at the trailhead in Monson says it plainly: "There are no places to obtain supplies or get help until Abol Bridge, 100 miles north. Do not attempt this section unless you have a minimum of 10 days supplies and are fully equipped."
That's not exaggeration. The 100-Mile Wilderness runs from Monson, Maine to Abol Bridge at the southern boundary of Baxter State Park — 100 miles of boreal forest, granite-capped peaks, remote ponds, and bog crossings. No towns, no stores, no bail-out options you can count on. This is the Appalachian Trail at its most serious and most spectacular.
This 7-day itinerary is written for a strong backpacker covering 13–15 miles per day. First-timers should plan 9–10 days.
100-Mile Wilderness Appalachian TrailBefore You Go: Key Logistics
- Trailhead: Monson, ME. Shaw's Hostel is the classic pre-hike base — they hold your car, do a gear check, and cook an enormous breakfast before you leave. Book ahead; they fill up.
- Lean-tos (trail shelters): Throughout the route you'll sleep in lean-tos — free, three-sided wooden shelters built by the Appalachian Trail Conservancy, each with a flat sleeping platform, fire ring, and privy. They sleep 6–8 people on a first-come, first-served basis. You can tent nearby if the shelter is full. No reservations.
- Water: Filter everything. Giardia is present in Maine streams. Sawyer Squeeze or SteriPen recommended — carry 3L capacity minimum between sources.
- Bear protection: Bear canister or Ursack required in Baxter State Park at the northern end. Smart for the whole route.
- Permit: No permit for the 100-Mile Wilderness itself. Baxter State Park camping and Katahdin summit permits required if you continue — get these at baxterstateparkauthority.com well in advance.
- Season: Mid-July through September is ideal. August = fewer bugs, manageable river levels, long days. June = extreme mud and black flies. September = best foliage, cold nights.
- Shuttle: Shaw's Hostel runs shuttles between Monson and Abol Bridge (80 miles by road). Book before you start.
Day 1 — Monson to Wilson Valley Lean-to (14 miles hiking)
Leave from the AT trailhead on Lake Hebron Road in Monson. The first miles are forgiving — flat forest trail across the East Branch of the Piscataquis River (usually knee-deep, easy crossing). Terrain gets serious on Barren Mountain — 1,400 ft of gain up to 2,670 ft elevation. The summit has open ledges with a clear view north: the Chairback Range fills the horizon ahead. Descend to Wilson Valley Lean-to (lean-to + tent sites, privy, stream 50 yards from shelter).
Barren Mountain AT Section MaineDay 2 — Wilson Valley to Carl A. Newhall Lean-to (15 miles hiking)
The hardest terrain of the first half. The Chairback Range hits you with four summits back-to-back: Columbus Mountain, Chairback Mountain, White Cap Mountain (3,654 ft, highest point in the 100-Mile Wilderness), and Gulf Hagas Mountain. Steep, rocky descents between each ridge. On a clear day from White Cap you can see Katahdin 60 miles north — that view is your motivation for the next five days.
End at Carl A. Newhall Lean-to (lean-to + tenting, privy, stream nearby). This is a full-effort day — budget 8–9 hours.
Chairback Range AT Section MaineGulf Hagas Side Trip — add this if your schedule allows
Gulf Hagas is a 3-mile slate gorge carved by the Pleasant River — five major waterfalls, canyon walls up to 130 ft high, and zero crowds compared to Acadia. Called the Grand Canyon of Maine. The AT junction is 0.4 miles south of Gulf Hagas Mountain, clearly marked. The full loop takes 4–5 hours. Camp at the Gulf Hagas lean-to and do it as a half-day before pushing on.
Gulf Hagas Loop MaineDay 3 — Carl A. Newhall to Logan Brook Lean-to (13 miles hiking)
A recovery day by 100-Mile standards. The route drops into a forested plateau between the Chairbacks and Barren Ledges — gentler terrain with good open-ridge views. Pass Cloud Pond (a wilderness campsite with lean-to right on the water — excellent lunch stop, worth the 0.1-mile spur) and continue north to Logan Brook Lean-to (lean-to + tenting, privy). Water: Logan Brook directly beside camp.
AT Section Barren Ledges to Logan Brook MaineDay 4 — Logan Brook to Antlers Campsite on Lower Jo-Mary Lake (15 miles hiking)
The route descends to the valley of the West Branch of the Pleasant River. This ford is the most serious water crossing of the trip — knee-deep in normal conditions, thigh-deep after rain. Move slowly, unbuckle your hip belt, use trekking poles as a third point of contact. If the current looks dangerous, wait it out; it typically drops 1–2 hours after rain stops.
After the ford, the route climbs into the stunning Nahmakanta Lake corridor — two large lakes, remote ponds, and the deepest sense of wilderness on the whole route. Camp at Antlers Campsite (tent sites + privy, no lean-to) directly on Lower Jo-Mary Lake. The evening light on the water is exceptional.
AT Section Logan Brook to Nahmakanta Lake MaineDay 5 — Antlers to Rainbow Spring Campsite (14 miles hiking)
Climb over Nesuntabunt Mountain (1,520 ft, 1,100 ft gain from the lake — short but steep) with a clear sight line north to Katahdin, unmistakably massive on the horizon. Descend to Rainbow Lake and follow the western shore trail. Camp at Rainbow Spring Campsite (tent sites + privy, no lean-to) on the north shore. The spring beside camp is one of the cleanest water sources on the route.
AT Section Nahmakanta to Rainbow Lake MaineDay 6 — Rainbow Spring to Hurd Brook Lean-to (13 miles hiking)
Cross the Rainbow Stream outlet (log bridge, easy) and enter the final approach corridor. The terrain flattens significantly — a broad boreal plateau feeling unlike the rocky ridgelines behind you. Watch for moose in the spruce bogs.
Rainbow Ledges (about mile 8 of the day) give the last clear view of Katahdin before the trees close in completely. Take your time here — this is the final open moment of the wilderness.
End at Hurd Brook Lean-to (lean-to + tenting, privy). 2 miles of easy trail from here to Abol Bridge. Water: Hurd Brook directly beside camp.
AT Section Rainbow Lake to Abol Bridge MaineDay 7 — Hurd Brook Lean-to to Abol Bridge (2 miles hiking)
An easy final morning. Pack deliberately, eat a full breakfast, take your time. You've covered 98 miles through genuine wilderness — the last 2 miles are ceremonial.
Cross Abol Bridge over the West Branch Penobscot River. Look north: Katahdin rises 5,000 feet straight out of the treeline in front of you. This is one of the most dramatic views in New England. Shaw's shuttle meets you at the bridge. If you have a Baxter permit for Katahdin, the Abol Trail starts 0.5 miles north.
Abol Trail to Baxter Peak KatahdinFood Planning
You carry everything from Monson — there is no resupply. For 7 days at this pace, plan 8 full days of food (one extra for weather delays). Target 1.5–2 lbs of food per day. Freeze-dried dinners + trail mix, peanut butter, and bars. Total food weight: 12–16 lbs depending on your choices.
Gear You'll Actually Need
- Rain gear that works: Maine is wet even in August. Not a drizzle concern — full-day cold downpour concern. Test your jacket before you leave.
- Gaiters: The bog crossings on puncheon bridges don't keep your feet dry. Mid-height gaiters make the difference.
- Trekking poles: Non-negotiable for the West Branch ford and rocky Chairback descents.
- A tent, not just a tarp: Black flies and mosquitoes in July are brutal enough that a full tent is the right call all season.
- Backup battery: No cell service for 7 days. 10,000 mAh handles a week of GPS use.
- Paper map: Download and print the MATC map set before you leave. Don't rely on cell signal.
