Mount Greylock is the highest point in Massachusetts at 3,489 feet (1,063 meters). Located in the northwest region of the state, it is part of the Taconic Mountains, a geologically distinct range from the nearby Berkshires and Green Mountains. Expansive views and a small area of sub-alpine forest characterize its upper reaches. A seasonal automobile road crosses the summit area near three structures from the 1930s; these together constitute a small National Historic District. Various hiking paths including the Appalachian Trail traverse the area, which is part of the larger Mount Greylock State Reservation.
The peak is mentioned in works by Nathaniel Hawthorne, Herman Melville, and Henry David Thoreau.
Geography
Mount Greylock is part of an massif called the "Greylock Range" near the Hoosic River, which hooks around the mountain on its eastern and northern footings. Various summits include Saddle Ball Mountain, along with Mount Fitch and others.
Standing about 2,000 feet (610 meters) above the local Hoosic Valley, Mount Greylock's summit is in Adams, Massachusetts. Other parts of the range extend into five neighboring towns. Sight lines of up to are possible from Greylock.
The Greylock massif is part of the Taconic Mountains, a geologically distinct range from the nearby Berkshires and Green Mountains separated here by the Hoosic Valley.
The massif is mostly within the Hudson River watershed via the Hoosic River, although a small part near Lanesborough is within the Housatonic River watershed."NOAA interactive map"
The eastern slopes of Greylock are noted for the Thunderbolt ski trail (see below), landslide scars above the city of Adams and "Greylock Glen," a state-sponsored development plan. The western slopes include "The Hopper," a twin-pronged valley caused by erosion. The mountain's north and southern reaches are noted for the presence of an auto road as well as hiking trails.
Climate
Forests and birds
Northern hardwood forest characterize lower and mid-elevations, while upper slopes are covered with balsam fir and red spruce as well as American mountain ash. About of old growth forest have been inventoried within the Greylock Range, including tree specimens up to 350 years old. On the western slope was a red spruce.
There are purported records of 132 bird species on the mountain. These include the blackpoll warbler and Bicknell's thrush which breed exclusively in boreal forest, with limited opportunities elsewhere in Massachusetts.
Geology Mount Greylock is part of the much larger Taconic Allochthon, a structure that migrated to its present position from 25 miles to the east.Potter, D. B. (December 1, 1968) "Time and space relationships of the Taconic allochthon and autochthon [book review]" The rocks moved via thrust faulting, a tectonic process by which older rock is thrust over and above younger rock.The Taconic Controversy: What Forces Make a Range? Appalachia: Vol. 73: No. 1 Article 5
More narrowly, the local massif is mostly "Greylock Schist," a term used by geologists starting in 1891 and much more recently, although the age of these rocks had been uncertain into the 1960s.see page 41-42 of ""Taconic Stratigraphic Names: Definitions and Synonymies" by E-an Zen, 1964 U Geological Survey Bulletin 1174 This Ordovician schist is about 1,000 to 2,000 feet thick on Greylock and "consists of muscovite (sericite), chlorite, and quartz schist." It lies above a formation called "Bellows Pipe Limestone.""National Geologic Map Database: Unit Greylock This younger, underlying layer has been quarried on the lower slopes of the mountain.
Successive episodes of ice-age glaciation rounded the mountain, leaving glacial erratics such as "Balance Rock" on Greylock in Lanesborough. The Laurentide Ice Sheet had covered the region up to a depth of one kilometer (or 3,281 feet). In melting, it formed Lake Bascom in the upper Hoosic Valley."Lake Bascom and the deglaciation of northwestern Massachusetts" Bierman, et al., 1986 The remains of lake beaches are evident at several places on the lowest slopes of Greylock.
Geologists used Surface Exposure Dating in 2018 to measure the rate of Pleistocene de-glaciation of the region. This method offered data in support of a more rapid melting rate in New England compared with earlier estimates.
Name "Mount Greylock" as the mountain's present name "probably originated with Williams College Professor Albert Hopkins" (1807–1872) or another local professor of the same era, according to one 1988 source.see chapter one, "Most Excellent Majesty: A History of Mount Greylock," Berkshire County Land Trust and Conservation Fund, 1988. The peak's namesake, Gray Lock(c. 1670–1750) was an Abenaki tribal figure from near Westfield, Massachusetts, known for raiding English outposts near the Connecticut River and not historically associated with the mountain.
The 18th century English may have called the peak "Grand Hoosuc," although Timothy Dwight IV referred to it as "Saddle Mountain" in his travel memoir concerning the late 18th century."Travels in New York and New England" Timothy Dwight 1821"
In the early 19th century it was called "Saddleback Mountain" because of its appearance seen from the south. According to a 1838 journal entry (posthumously published 1868), Nathaniel Hawthorne overheard a local resident calling it "Graylock." Hawthorne added that Saddleback "is a more usual name for it." Yet elsewhere Hawthorne simply called it Graylock, attributing this name to the mountain's frequent appearance in winter frost.see July 27 entry, "American Notebooks, Vol I" Hawthorne
Nonetheless, as of 1841, Edward Hitchcock's authoritative "Final Report" on state geology called the entire massif "Saddle Mountain" and "the highest point of the summit" according to Hitchcock was called "Graylock." .page 247, "Final Report on the Geology of Massachusetts>" 1841 Edward Hitchcock
Historic District Three structures contribute to the 1930s "Mount Greylock Summit Historic District," which is part of the National Register of Historic Places as of 1998. These are the Bascom Lodge and the Thunderbolt Ski Shelter, both designed by Pittsfield architect, Joseph McArthur Vance, and the War Memorial Tower designed by Boston-based Maginnis & Walsh. Together, their cultural significance as period architecture was cited in the register
Bascom Lodge
Bascom Lodge was built between 1932 and 1938 using native materials of Greylock schist and red spruce and characterized by the rustic design of period park structures. The Greylock Commission sought a more substantial shelter to replace an earlier summit house (built c.1902; destroyed by fire in 1929). The initial west wing was constructed in 1932 by Jules Emil Deloye Jr. The main-central and east wings were completed later 1935–38 by the Civilian Conservation Corps, supervised by Deloye. The lodge was named in honor of John Bascom, a Greylock Reservation Commissioner and local professor (d. 1911).
For the winter of 1937–38, the Greylock Commission hired Harrison L. Lasuer to spend the season living in the lodge "to act as host to skiers and other Winter enthusiasts who scale the mountain."."Will Winter on Greylock in Mountain 'Penthouse' " November 13, 1937, New York Times, Page 41, The building was equipped for that winter with "steam heat, electricity and a telephone," according to a New York City newspaper. A ski race later that season attracted 7,000 spectators, mainly near the base of the mountain (see ref. below).
Today (2025) Bascom Lodge is run (in warmer months only) by a service company under a concession-type lease from the state. Among other earlier arrangements, the Appalachian Mountain Club managed the lodge for 16 summers ending in 2000."Appalachian Mountain Club will no longer manage Bascom Lodge 12:00AM / Wednesday, December 20, 2000"iBerkshires.com
Thunderbolt Ski Shelter, Trail and Race Series
The Thunderbolt Ski Shelter, also designed by Joseph McArthur Vance, was built in 1940 by the Civilian Conservation Corps (CCC) as a warming hut for skiers using the Thunderbolt Trail.Greylock State Reservation Commission Report for 1940
Like the nearby lodge, the shelter is rustic in design and built of local stone and wood beams; the interior has four wooden benches built into a large four-hearth fireplace in the center. It is several hundred feet north of the summit tower.
Although Bascomb Lodge reportedly employed a resident winter innkeeper in 1938 (see above citation), the 1940 introduction of this nearby shelter may have made a seasonal shut-down of the lodge less inconvenient during large-scale ski events of the era.
This trail was designed with help from numerous ski groups and cut by the CCC in 1934. Major competitive ski races were held on here almost annually from 1935 until 1948. Among the largest was a 1938 event attended by 7,000 spectators, who watched Fritz Dehmel of Nazi Germany set a course record of 2 minutes and 25 seconds."Tony Matt Annexes Mount Greylock Event" January 28, 1940, New York Times page 21"Dehmel Annexes Eastern Ski Race" February 7, 1938, NYT page 18 Famed U.S. skier Dick Durrance placed fifth in this race, which pre-dated the Thunderbolt shelter. Dehmel's record for the 1.4-mile course held until 1948. The trail is similar in steepness to the longer Sherburne Trail of Pinkham Notch, New Hampshire."Power Project" Thunderbolt Ski Trail" a slightly weak but useful source
The Thunderbolt ski race was revived in 2010 and in certain subsequent years, but a lack of snow disrupted or relocated some of the events to commercial ski areas with artificial snow. In 2018, the race group said it would switch to "less frequent intervals" for the event, instead of annually. "Legendary Thunderbolt trail is the site of a rando race" New England Ski Journal, Brion O'Connor, February 19, 2022 Separately, a 1990s landslide area on the eastern face of Greylock that is unrelated to the Thunderbolt trail was reportedly skied in 2005 "A first ski descent of Mt. Greylock's massive rockslide" Mountainzone, Nick Weinberg, January 30, 2005
Veterans War Memorial Tower
The Veterans War Memorial Tower was approved by the state legislature in 1930, supported by local lawmakers and Governor Frank G. Allen. It was completed two years later at a cost of $200,000 by contractors J.G. Roy & Son of Springfield. An estimated 1,500 people attended the 1933 dedication by Governor Joseph B. Ely, an event broadcast nationally over NBC radio.
The shaft with eight observation windows, was designed to display classic austerity. It includes Art Deco details, some by John Bizzozero of Quincy, whose work also appears on the Vermont Capitol building. Inside at ground level is a domed chamber intended to store tablets and war relics.
Although area legislators and residents wanted local stone, the tower's granite facing was obtained in Quincy. The tower bears various inscriptions including, "they were faithful even unto death." One of the inscriptions inside the monument reads, "Of those immortal dead who live again in the minds made better by their presence", which is a line from a poem by George Eliot. The translucent globe of light on top, originally illuminated by twelve 1,500 watt lights (now six), is said to be visible at night for . It creates a light-pollution problem for the summit area all night long.
The Veterans War Memorial Tower was closed for four years beginning in 2013 because of water infiltration that caused structural damage from freezing. A $2.6-million restoration project that began in August 2015 was awarded to Allegrone Construction of Pittsfield.The Berkshire Eagle April 4, 2016 & 5/11/16
Broadcast tower