Mount Greylock elevation
Mount Greylock rises to 3,491 ft (1,064 m) above sea level, the highest point in Massachusetts.
Published summit elevation
3,491ft
1,064 m above sea level
Summit · NGVD 29 (the older U.S. vertical datum)
- USGS 3DEP grid value (secondary)
- 3,491 ft (1,064 m)
- Highest grid value within 250 m of the GNIS summit point.
- Source: USGS 3D Elevation Program
- Rise above North Adams, MA
- 2,767 ft
- 3.6 mi from the summit; nearest incorporated place
- Source: USGS 3DEP at the town center
- Rank in state
- Highest point in Massachusetts
- Source: USGS Elevations and Distances
Data updated · By Ankit Kumar, compiled from public U.S. government and open datasets · How these numbers are made
Check your exact spot in the Mount Greylock area
Elevation changes from street to street. Use your location, search an address or click the map to get the USGS value for one point. Green pins mark the points named on this page.
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Life at 3,491 ft
Standard-atmosphere estimates for the summit of Mount Greylock (3,491 ft, from the USGS grid value). Weather moves the real values a little from day to day.
- Oxygen per breath
- 88 % of sea level
- Air is still 20.9% oxygen; there is just less air.
- Home canning
- Above 1,000 ft, USDA processing times and pressure-canner pounds go up.
- Canning adjustments
Sources: pressure from the U.S. Standard Atmosphere, 1976 (NOAA, NASA, USAF); boiling point from the Antoine equation for water (Lange's Handbook of Chemistry); canning thresholds from the USDA Complete Guide to Home Canning. Not medical or food-safety advice; follow the tested USDA recipe for your altitude.
Health note: the CDC says unacclimatized travelers risk altitude illness when sleeping at about 8,000 ft or higher, and sometimes lower. This page is general information, not medical advice; read the CDC guidance on high-altitude travel and talk to a clinician before a high climb.
Landmark elevations
| What | Value | Source |
|---|---|---|
| Published summit elevation | 3,491 ft (1,064 m) | USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001) |
| Highest USGS 3DEP value near the summit | 3,491 ft (1,064 m) | USGS 3DEP, 81 points within 250 m |
| USGS 3DEP at the GNIS summit point | 3,491 ft (1,064 m) | USGS 3DEP + GNIS coordinates |
| Nearest town: North Adams, MA | 724 ft (221 m) · 3.6 mi away | Census Gazetteer + USGS 3DEP |
| Nearest public airport: Harriman-and-West (KAQW) | 654 ft (199 m) · 4.1 mi away | FAA field elevation |
| Ragged Mountain (nearby summit) | 2,530 ft (771 m) · 1.1 mi away | GNIS position, USGS 3DEP at that point |
| Mount Fitch (nearby summit) | 3,106 ft (947 m) · 1.3 mi away | GNIS position, USGS 3DEP at that point |
| Stony Ledge (nearby summit) | 2,581 ft (787 m) · 1.5 mi away | GNIS position, USGS 3DEP at that point |
| Saddle Ball Mountain (nearby summit) | 3,254 ft (992 m) · 1.9 mi away | GNIS position, USGS 3DEP at that point |
| Mount Prospect (nearby summit) | 2,682 ft (817 m) · 2.0 mi away | GNIS position, USGS 3DEP at that point |
Mount Greylock at a glance
| What | Value | Source |
|---|---|---|
| County | Berkshire | USGS GNIS |
| USGS 7.5-minute topo map | Williamstown | USGS GNIS |
| Summit coordinates | 42.63717, -73.16594 | USGS GNIS |
More peaks and tools
- Mount Marcy, NY — 5,343 ft, 109 mi away
- Mount Lafayette, NH — 5,242 ft, 130 mi away
- Mount Mansfield, VT — 4,395 ft, 133 mi away
- Mount Monroe, NH — 5,353 ft, 145 mi away
- Mount Washington, NH — 6,287 ft, 146 mi away
- All Massachusetts elevations
Frequently asked questions
How tall is Mount Greylock?
Mount Greylock is 3,491 ft (1,064 m) above sea level, according to USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001), on the NGVD 29 datum. The highest USGS 3DEP grid value near the summit is 3,491 ft.
Where is Mount Greylock?
Mount Greylock is in Berkshire County, Massachusetts, at 42.6372, -73.1659, about 3.6 mi from North Adams. It appears on the USGS Williamstown 7.5-minute topographic map.
How much oxygen is there at the top of Mount Greylock?
At 3,491 ft, water boils at about 205.6 °F (96.5 °C) and standard air pressure is 26.33 inHg (892 hPa), so each breath holds about 88% of the oxygen it would at sea level. The CDC says unacclimatized travelers risk altitude illness when they sleep at about 8,000 ft or higher, and sometimes lower.
What is the closest airport to Mount Greylock?
The nearest public-use airport is Harriman-and-West (KAQW), 4.1 mi away in a straight line, at 654 ft (FAA).
Sources
- USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001) — elevation of Summit
- USGS Elevation Point Query Service (3DEP) — grid elevation near the summit, nearby summits and the nearest town
- USGS Geographic Names Information System (GNIS), Domestic Names — summit name, position, county and topo map
- U.S. Census Bureau, 2024 Gazetteer Files (places) — nearest incorporated town
- FAA Aeronautical Information Services, Airports (field elevation) — airport field elevation
- U.S. Standard Atmosphere, 1976 (NOAA/NASA/USAF); water boiling point by the Antoine equation (Lange’s Handbook of Chemistry) — boiling point, air pressure and oxygen
- CDC Yellow Book: High-Altitude Travel and Altitude Illness — altitude illness threshold
How each number is produced: methodology and data sources.
Data updated · By Ankit Kumar, compiled from public U.S. government and open datasets · How these numbers are made