4,004 ft | Presidential | 0 routes
As of August 29, 2026
Trail conditions on Mount Isolation are currently rated Moderate. It's 47°F (feels like 35°F) with WNW winds at 17 mph. Mount Isolation (4,004 ft) is #47 of 48 on the NH 48 list. See the hour-by-hour Mount Isolation weather forecast for summit temps, wind chill, and the best hiking window.
Mount Isolation weather forecast
Hourly summit temps, wind chill & freezing level, trailhead to summit
Feels like 35°F
~3.4°F drop per 1,000ft
Conditions summary as of August 29, 2026
Saturday offers dry, clear conditions on Mount Isolation with mild summit temperatures, though brisk winds will make it feel notably colder, especially above treeline sections of the approach. Trail reports indicate a mix of dry trail and mud (especially on the approach to Isolation Spur), so expect some tiptoeing around wet or muddy sections. An early morning start is recommended to maximize the dry weather window before Sunday's showers move in.
Expect temperatures to drop roughly 3-4°F per 1,000 feet gained, with winds picking up from about 16 mph at the trailhead to near 25 mph with wind chills near 40°F by treeline; pack a wind layer to add once you approach the exposed upper sections near the summit.
Best Hiking Window
Saturday early morning through early afternoon, starting near sunrise (6:03 AM) to take advantage of clear skies and lighter winds before afternoon cloud increase
Last synthesized Aug 29, 7:20 AM
Planning a hike here this week?
Trailblazer adds the full 7-day summit forecast, the best day to go for every peak, and conditions for each route up.
Trail: Glen Boulder Trail, Davis Path, Isolation Spur, Isolation Trail, Rocky Branch Trail
Conditions: Dry Trail, Mud - Minor/Avoidable
“Glen Boulder trail was dry with great views. Davis Path was similar. Isolation trail dry as well. Good visibility at the summit with some high clouds. Temps in 90s when I started. Mid 60s with a breeze above treeline. Rocky Branch was a long slog with lots of rock hopping. 9 hours total.”
Trail: Glen Boulder Trail, Davis Path, Isolation Spur
Conditions: Dry Trail, Mud - Minor/Avoidable, Mud - Significant
“This is the year of Isolation for me... It happens when you avoid it but need it for a list... Once entering the scrub on Davis Path towards Isolation, the trail is a mix of dry trail and mud. The mud appears to be solidifying a bit in places, but prepare for a mix of tiptoeing on rocks, branches, and old plank bridges. There are a few spots that you might find yourself stepping, wondering if it is a tip of a rock or mud. Sometimes you will get lucky; sometimes you won't. Very quiet morning, not seeing anybody until my return to below Glen Boulder where a group was headed up to celebrate one of the members' finish to the NH 48. Congrats! Beautiful morning but warm and HUMID. Another spot-on report for the Higher Summits Forecast.”
Trail: Rocky Branch Trail, Isolation Trail, Davis Path, Isolation Spur
Conditions: Dry Trail, Wet Trail, Wet/Slippery Rock, Standing/Running Water on Trail, Mud - Minor/Avoidable
“As expected, there was running/standing water on the Rocky Branch Trail and the Isolation Trail. Most of the water and muck can be avoided by using rocks or using well-worn short by-passes. The mud was dryer than usual on the Davis Path. There are other stretches of dry trail especially the ascent from the trailhead to the height of land on the Rocky Branch Trail. There are primitive campsites off Rocky Branch Trail just before reaching the crossing of Rocky Branch River (signed). There is another campsite high up on the Isolation Trail East (signed). There are good views from the open summit of Mt Isolation. There are two markers at the summit. There are a couple of places on the Davis Path that allow for some views. Most of the trail is a forest hike with stretches of wet trail. Hiked a good portion of the trail with Randy (Hopkinton MA) and Miles (Nottingham NH).”
Tap a day header to expand to 3hr or hourly detail
Today Aug 29 | Tomorrow Aug 30 | Monday Aug 31 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| AM | PM | night | AM | PM | night | AM | PM | night | |
| Temperature & Wind | |||||||||
| Weather | sunny | sunny | cloudy | cloudy | drizzle | drizzle | sunny | sunny | cloudy |
| Temp °F hi / lo | 49° 48° | 54° 50° | 56° 55° | 56° 54° | 58° 54° | 55° 53° | 55° 53° | 58° 56° | 57° 55° |
| Chill °F | 43° | 44° | — | — | — | — | — | — | — |
| Wind mph | 12 | 18 | 35 | 37 | 26 | 20 | 9 | 8 | 4 |
| Gust mph est. | 19 | 29 | 56 | 59 | 42 | 32 | 14 | — | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | - | - | - | 0.1 | - | - | - | - |
| Freezing ft | 12,500 ft | 12,058 ft | 13,201 ft | ||||||
| Conditions | |||||||||
| Cloud cover | - | 27% | 100% | 100% | 100% | 100% | - | 6% | 100% |
| Vis mi | clear | clear | clear | clear | 3 | clear | clear | clear | clear |
| UV | 5 | 7 | — | 4 | 6 | — | 5 | 7 | — |
Tap a day header to expand AM/PM/Night detail
| Elevation | Today Aug 29 | Tomorrow Aug 30 | Monday Aug 31 |
|---|---|---|---|
| lo/hi °F · wind mph & dir · chill °F | |||
| Summit 4,004 ft | 48/49° 12 | 54/56° 37 | 53/55° 9 |
| 3,300 ft | 49/52° 12 | 57/58° 30 | 55/59° 7 |
| 2,500 ft | 51/55° 9 | 60/62° 19 | 53/63° 6 |
| Trailhead 2,000 ft | 52/57° 8 | 61/64° 16 | 54/65° 5 |
4 more days of forecast — plan around the weather window, not just tomorrow.
Conditions synthesized from: NWS Higher Summits Forecast, NOAA Open-Meteo, Mount Washington Observatory, NETC Trip Reports, NOHRSC Snow Depth, Mt. Washington Avalanche Center, USGS Stream Levels, OpenWeather Air Quality.
AI-generated from public data. Always verify conditions before heading out — backcountry weather can change quickly.
No routes available for this peak.
Aptly named remote peak in the Presidential Range. Long approaches from all directions.
Elevation
4,004 ft
Range
Presidential
Rank
#47 of 48
Difficulty
Very Difficult
Coordinates
44.2148, -71.3093
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2 incidents on file · drawn from NH Fish and Game releases and regional reporting
59-year-old female hiker from Londonderry, NH
Lynn McFarland, 59, began hiking Mt. Isolation with a friend on February 20, 2023; her partner turned back while she continued alone, summiting around 3:00 p.m. She lost the trail on the descent and was approximately 1,400 feet off trail before calling for help. Conservation Officers hiked in to locate her, but she found the trail on her own and met them before 1:00 a.m., returning to the trailhead around 2:15 a.m.
56-year-old woman from Kittery, Maine
Susan Wiswell, age 56, became disoriented after following signs to a campsite off the Isolation Trail on September 21, 2011, and could not find her way back. She called 911 at approximately 1:30 pm; an overnight search failed to locate her. Search teams found her the following morning near the Rocky Branch Trail in good condition, and she hiked out under her own power.