Reality Check · Bridgeport, CT
2026 GMC Sierra EV AT4 / Denali in Bridgeport, CT
Winter range, charging cost and how far it goes, worked out for Bridgeport's weather, grid and prices.
Bridgeport's winters are cool rather than cold: on a typical January day (31°F) a Sierra EV AT4 / Denali gets an estimated 347 miles, 15% under its 410-mile rating, and about 344 in the coldest week (around January 19, when it averages 31°F). By June it's back to about 421. Charging at home at Connecticut's average rate (24.2¢/kWh) costs about $144 a month for 38 miles a day, against $298 for a gas Sierra on New England's gas. And Bridgeport's grid (NPCC New England), 30% cleaner than the US average, makes it 77% less CO₂ than gas.
Partly estimated. 2 of 5 temperature bands are from 117 real drives of this model; the rest come from 1,548 real drives in EVs at each temperature (and Recurrent's winter study below freezing), applied to its 410-mile rating. Each band switches to its own drives once it has 20 from 3 drivers.
October rangeEstimated
403mi
At Bridgeport's typical October day, 56°F · 35% highway
Winter lowEstimated
344mi
January, 31°F; Jan 19–25 at 31°F · lows near 24°F
Home chargingEstimated
$144/mo
12.5¢ a mile at 24.2¢/kWh. Gas Sierra: $298/mo
Bridgeport's grid
0.54lb CO₂/kWh
NPCC New England (EPA eGRID): 30% cleaner than the US, 77% less CO₂ than gas
Bridgeport, season by seasonEstimated
A Sierra EV AT4 / Denali's range on a full charge, averaged over each season's months (30-year normal temperatures), at 35% highway.
Winter Dec–Feb · 34°F
13% below its 410-mile rating · coldest week 344 mi
356mi
Spring Mar–May · 50°F
4% below its rating
393mi
Summer Jun–Aug · 73°F
4% above its rating
426mi
Fall Sep–Nov · 57°FNow
About its rating
403mi
A Sierra EV AT4 / Denali's range through a Bridgeport yearEstimated
Each month at Bridgeport's 30-year normal temperature, 35% highway. 32 days a year average below freezing.
How far it goes from Bridgeport, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 181 mi out and back, 363 mi one way (January: 312 mi). Dots are DC fast chargers by network.
Fast charging around Bridgeport
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 79DC fast chargers within 25 mi
- 1.1 mito the nearest
- ChargePoint392 in reach
- Tesla Supercharger236
- EVgo187
- Electrify America114
- EV Connect84
Road trips in October, about, by road: Harrisburg (254 mi) and Syracuse (248 mi) one way on a charge.
Questions Bridgeport drivers ask
How far can a Sierra EV AT4 / Denali go in a Bridgeport winter?
About 347 miles on a typical January day (31°F) and about 344 in the coldest week of the year (around January 19, 31°F on average), estimated from real EV drives at those temperatures. That's 15–16% below its 410-mile rating, mostly from heating the cabin and the battery. Bridgeport averages 32 days a year below freezing.
How much does it cost to charge a Sierra EV AT4 / Denali in Bridgeport?
About $144 a month at home for 38 miles a day, at Connecticut's average home electricity rate of 24.2¢/kWh: about 12.5¢ a mile. A gas Sierra on New England's average gas ($4.25 a gallon) costs about $298 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in Bridgeport?
Not at 38 miles a day: a 120 V outlet adds only about 31 miles in 12 hours on an average day (26 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 hours.
Is it greener to drive electric on Bridgeport's grid?
Yes, more than most places. Bridgeport's grid (NPCC New England) is 30% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 77% less CO₂ than a gas Sierra.
Check it for your own address
Your street, your daily miles, any temperature on the knob.
Sierra EV AT4 / Denali Reality Check near Bridgeport
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Bridgeport Sikorsky Mem Airport, CT; home electricity, EIA (Connecticut, July 2026); gas, EIA weekly (New England); grid CO₂, EPA eGRID 2023; cold-weather range, PlugLog's real drives and Recurrent's winter study (Nov 2025); chargers, Open Charge Map and PlugLog. Updated Oct 22, 2026.