Reality Check · Washington, DC
2026 GMC Sierra EV AT4 / Denali in Washington, DC
Winter range, charging cost and how far it goes, worked out for Washington's weather, grid and prices.
Washington's winters are cool rather than cold: on a typical January day (38°F) a Sierra EV AT4 / Denali gets an estimated 369 miles, 10% under its 410-mile rating, about the same as in the coldest week (around January 16, when it averages 37°F). By May it's back to about 418. Charging at home at Washington, DC's average rate (25.2¢/kWh) costs about $147 a month for 38 miles a day, against $302 for a gas Sierra on the Central Atlantic's gas. And Washington's grid (RFC East), 22% cleaner than the US average, makes it 75% 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
409mi
At Washington's typical October day, 61°F · 35% highway
Winter lowEstimated
367mi
January, 38°F · lows near 30°F
Home chargingEstimated
$147/mo
12.7¢ a mile at 25.2¢/kWh. Gas Sierra: $302/mo
Washington's grid
0.60lb CO₂/kWh
RFC East (EPA eGRID): 22% cleaner than the US, 75% less CO₂ than gas
Washington, 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 · 40°F
8% below its 410-mile rating · coldest week 367 mi
377mi
Spring Mar–May · 58°F
About its rating
405mi
Summer Jun–Aug · 79°F
4% above its rating
427mi
Fall Sep–Nov · 61°FNow
About its rating
409mi
A Sierra EV AT4 / Denali's range through a Washington yearEstimated
Each month at Washington's 30-year normal temperature, 35% highway. No day of the year averages below freezing.
How far it goes from Washington, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 184 mi out and back, 368 mi one way (January: 332 mi). Dots are DC fast chargers by network.
Fast charging around Washington
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 241DC fast chargers within 25 mi
- 0.5 mito the nearest
- Tesla Supercharger315 in reach
- ChargePoint275
- EVgo251
- Electrify America116
- Blink108
Road trips in October, about, by road: Poughkeepsie (316 mi) and Greensboro (310 mi) one way on a charge.
Questions Washington drivers ask
How far can a Sierra EV AT4 / Denali go in a Washington winter?
About 369 miles on a typical January day (38°F) and about the same in the coldest week of the year (around January 16, 37°F on average), estimated from real EV drives at those temperatures. That's 10% below its 410-mile rating, mostly from heating the cabin and the battery.
How much does it cost to charge a Sierra EV AT4 / Denali in Washington?
About $147 a month at home for 38 miles a day, at Washington, DC's average home electricity rate of 25.2¢/kWh: about 12.7¢ a mile. A gas Sierra on the Central Atlantic's average gas ($4.31 a gallon) costs about $302 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in Washington?
Not at 38 miles a day: a 120 V outlet adds only about 31 miles in 12 hours on an average day (28 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 hours.
Is it greener to drive electric on Washington's grid?
Yes, more than most places. Washington's grid (RFC East) is 22% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 75% 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 Washington
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Washington Reagan Airport, VA; home electricity, EIA (Washington, DC, July 2026); gas, EIA weekly (the Central Atlantic); 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.