The Mount Tom, Field, Willey, and Avalon Loop is a 9.4-mile loop with 3,325 ft of elevation gain.
9.4 mi • 3,325 ft gain • 5-8 hours • A-Z Trailhead
Feels like 34°F
Best Hiking Window
Saturday early morning through early afternoon offers the driest, clearest conditions before Sunday's drizzle and stronger winds arrive
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.
Summit-level conditions by time of day at 4,340' elevation
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 | 48° 47° | 53° 48° | 55° 54° | 55° 53° | 57° 54° | 54° 51° | 52° 51° | 57° 52° | 55° 55° |
| Chill °F | 41° | 41° | — | — | — | — | — | — | — |
| Wind mph | 13 | 18 | 37 | 39 | 28 | 31 | 12 | 11 | 7 |
| Gust mph est. | 21 | 29 | 59 | 62 | 45 | 50 | 19 | 16 | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | - | - | - | 0.1 | 0.1 | - | - | - |
| Freezing ft | 12,280 ft | 11,583 ft | 13,281 ft | ||||||
| Conditions | |||||||||
| Cloud cover | 5% | 12% | 100% | 100% | 100% | 100% | - | 6% | 100% |
| Vis mi | 8 | clear | clear | clear | 4 | 5 | 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 4,340 ft | 47/48° 13 | 53/55° 39 | 51/52° 12 |
| 4,100 ft | 47/48° 13 | 54/56° 38 | 52/53° 11 |
| 3,300 ft | 48/51° 14 | 57/58° 30 | 54/56° 8 |
| 2,500 ft | 49/55° 10 | 60/62° 18 | 54/61° 7 |
| Trailhead 2,000 ft | 51/57° 9 | 61/64° 15 | 54/63° 6 |
4 more days of forecast — plan around the weather window, not just tomorrow.
Full hourly summit forecasts: Mount Field weather · Mount Willey weather · Mount Tom weather
The Mount Tom, Field, Willey, and Avalon Loop is a 9.4-mile loop in New Hampshire's White Mountains, starting at A-Z Trailhead. It climbs about 3,325 ft — an average of 354 ft per mile — which works out to roughly 5-8 hours at AMC book time. It summits 3 named peaks, topping out on Mount Field at 4,340 ft: Mount Field (4,340 ft), Mount Willey (4,285 ft), Mount Tom (4,051 ft). HikerNerd rates it Difficult on effort alone — check the current conditions above before committing, since weather above treeline changes the day far more than the numbers do.
Distance
9.4 mi
Elevation Gain
3,325 ft
Duration
5-8 hours
Trailhead
A-Z Trailhead
The Mount Tom, Field, Willey, and Avalon Loop is 9.4 miles around the loop, starting at A-Z Trailhead. At AMC book time — half the distance in hours plus 30 minutes per 1,000 ft of climbing — that works out to roughly 5-8 hours. Most parties take longer than book time on rough or above-treeline terrain, in winter, or with a heavy pack.
The Mount Tom, Field, Willey, and Avalon Loop climbs about 3,325 ft over 9.4 miles — an average of roughly 354 ft of gain per mile. That figure is cumulative ascent across the whole loop, not the difference between the trailhead and the high point.
HikerNerd rates the Mount Tom, Field, Willey, and Avalon Loop Difficult, scored with the Shenandoah difficulty formula — √(elevation gain × 2 × distance) — applied to its 9.4 miles and 3,325 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 Mount Tom, Field, Willey, and Avalon Loop summits 3 named peaks: Mount Field, Mount Willey, Mount Tom.
The Mount Tom, Field, Willey, and Avalon Loop starts at A-Z Trailhead. Check the trail alerts on this page before you drive — trailhead access and parking in the White Mountains change with closures and construction.
Been to Mount Tom, Field, Willey, and Avalon Loop?
Be the first to share your experience!