Reality Check · Hartford, CT
2026 GMC Sierra EV AT4 / Denali in Hartford, CT
Winter range, charging cost and how far it goes, worked out for Hartford's weather, grid and prices.
In a typical Hartford January (29°F), a Sierra EV AT4 / Denali gets an estimated 336 miles on a charge, 18% less than its 410-mile rating, and about the same in the coldest week of the year (around January 21, when it averages 28°F). By June it's back to about 421. Charging at home at Connecticut's average rate (24.2¢/kWh) costs about $146 a month for 38 miles a day, against $298 for a gas Sierra on New England's gas. And Hartford's grid (NPCC New England), 30% cleaner than the US average, makes it 76% 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
400mi
At Hartford's typical October day, 54°F · 35% highway
Winter lowEstimated
334mi
January, 29°F · lows near 20°F
Home chargingEstimated
$146/mo
12.6¢ a mile at 24.2¢/kWh. Gas Sierra: $298/mo
Hartford's grid
0.54lb CO₂/kWh
NPCC New England (EPA eGRID): 30% cleaner than the US, 76% less CO₂ than gas
Hartford, 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 · 31°F
16% below its 410-mile rating · coldest week 334 mi
345mi
Spring Mar–May · 50°F
4% below its rating
392mi
Summer Jun–Aug · 73°F
4% above its rating
426mi
Fall Sep–Nov · 54°FNow
About its rating
400mi
A Sierra EV AT4 / Denali's range through a Hartford yearEstimated
Each month at Hartford's 30-year normal temperature, 35% highway. 60 days a year average below freezing.
How far it goes from Hartford, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 180 mi out and back, 360 mi one way (January: 303 mi). Dots are DC fast chargers by network.
Fast charging around Hartford
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 75DC fast chargers within 25 mi
- 1.1 mito the nearest
- ChargePoint407 in reach
- Tesla Supercharger222
- EVgo170
- Electrify America108
- EV Connect84
Road trips in October, about, by road: Harrisburg (303 mi) and Syracuse (247 mi) one way on a charge.
Questions Hartford drivers ask
How far can a Sierra EV AT4 / Denali go in a Hartford winter?
About 336 miles on a typical January day (29°F) and about the same in the coldest week of the year (around January 21, 28°F on average), estimated from real EV drives at those temperatures. That's 18% below its 410-mile rating, mostly from heating the cabin and the battery. Hartford averages 60 days a year below freezing.
How much does it cost to charge a Sierra EV AT4 / Denali in Hartford?
About $146 a month at home for 38 miles a day, at Connecticut's average home electricity rate of 24.2¢/kWh: about 12.6¢ 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 Hartford?
Not at 38 miles a day: a 120 V outlet adds only about 30 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 Hartford's grid?
Yes, more than most places. Hartford's grid (NPCC New England) is 30% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 76% 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 Hartford
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Hartford Brainard Fld, 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.