Connecticut elevation
Connecticut runs from sea level (Long Island Sound) to 2,380 ft at Mount Frissel on south slope at State line, with an average of about 453 ft.
Highest point: Mount Frissel on south slope at State line
2,380ft
725 m above sea level
Mount Frissel on south slope at State line, Litchfield County · NGVD 29 (the older U.S. vertical datum)
- Lowest point: Long Island Sound
- 0 ft (sea level)
- Source: USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001)
- Average elevation (sampled)
- 453 ft (138 m)
- Mean of 229 USGS points about 8 km apart; an estimate, not a published figure.
- Source: USGS 3DEP + 2024 Census boundary
Data updated · By Ankit Kumar, compiled from public U.S. government and open datasets · How these numbers are made
Connecticut places on this site
Cities and towns (USGS, downtown)
- Hartford51 ft
Connecticut elevation facts
| What | Value | Source |
|---|---|---|
| Highest point: Mount Frissel on south slope at State line | 2,380 ft (725 m) | USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001) |
| Lowest point: Long Island Sound | Sea level | USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001) |
| Vertical range | 2,380 ft (725 m) | Difference of the two figures above |
| Average elevation (sampled) | 453 ft (138 m) | USGS 3DEP, 229 grid points |
| Capital: Hartford | 51 ft (15 m) | USGS 3DEP at the city center |
| Land area | 4,842 sq mi (12,542 km²) | Census 2024 boundary file |
Life at 453 ft
Standard-atmosphere estimates for the state's sampled average elevation (453 ft). Weather moves the real values a little from day to day.
- Oxygen per breath
- 98 % of sea level
- Air is still 20.9% oxygen; there is just less air.
- Oxygen calculator
- Home canning
- At or below 1,000 ft, use the standard USDA sea-level times.
- Canning adjustments · Baking
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.
City elevations in Connecticut
- Waterbury271 ft
- Hartford (capital)51 ft
- New Haven39 ft
- Bridgeport19 ft
- Stamford16 ft
Largest places in Connecticut
The five incorporated places by 2024 Census population estimate.
| What | Value | Source |
|---|---|---|
| Bridgeport | 19 ft (6 m) · pop. 151,599 | USGS 3DEP; Census 2024 estimate |
| Stamford | 16 ft (5 m) · pop. 139,134 | USGS 3DEP; Census 2024 estimate |
| New Haven | 39 ft (12 m) · pop. 137,562 | USGS 3DEP; Census 2024 estimate |
| Hartford | 51 ft (15 m) · pop. 122,129 | USGS 3DEP; Census 2024 estimate |
| Waterbury | 271 ft (83 m) · pop. 115,908 | USGS 3DEP; Census 2024 estimate |
Frequently asked questions
What is the highest point in Connecticut?
Mount Frissel on south slope at State line at 2,380 ft (725 m), from USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001).
What is the lowest point in Connecticut?
Long Island Sound, at sea level, per the USGS Elevations and Distances table (2001).
What is the average elevation of Connecticut?
About 453 ft (138 m): the mean of USGS 3DEP elevations at 229 points on a regular grid about 8 km apart inside the state boundary. It is our estimate, not a published figure.
Which Connecticut city on this site is highest?
Hartford, at 51 ft downtown (USGS).
Does altitude affect cooking in Connecticut?
At 453 ft, water boils at about 211.2 °F (99.5 °C) and standard air pressure is 29.43 inHg (997 hPa), so each breath holds about 98% of the oxygen it would at sea level. That is for the state's average elevation; check your own town, because Connecticut spans 2,380 ft from lowest to highest.
Sources
- USGS, Elevations and Distances in the United States (highest and lowest elevations) (revised edition 2001) — highest point
- USGS, Elevations and Distances in the United States (highest and lowest elevations) — lowest point
- USGS Elevation Point Query Service (3DEP) — average elevation, city-center values and the high-point check
- U.S. Census Bureau, 2024 Cartographic Boundary Files (places, states; 1:500,000) — state boundary and land area
- U.S. Census Bureau, 2024 Gazetteer Files (places) — city locations
- U.S. Census Bureau, Vintage 2024 Population Estimates (cities and towns, July 1, 2024) — largest cities by population
- Wikidata (elevation statements that cite a source; the cited source is listed with each value) — state capital name
- 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
How each number is produced: methodology and data sources.
Every state: US elevation by state · Highest point in each state
Data updated · By Ankit Kumar, compiled from public U.S. government and open datasets · How these numbers are made