Reality Check · Denver, CO
2026 GMC Sierra EV AT4 / Denali in Denver, CO
Winter range, charging cost and how far it goes, worked out for Denver's weather, grid and prices.
Denver's winters are cool rather than cold: on a typical January day (32°F) a Sierra EV AT4 / Denali gets an estimated 349 miles, 15% under its 410-mile rating, and about 345 in the coldest week (around December 19, when it averages 31°F). By June it's back to about 420. Charging at home at Colorado's average rate (17.0¢/kWh) costs about $103 a month for 38 miles a day, against $297 for a gas Sierra on Denver's gas. Denver's grid (WECC Rockies) is 35% dirtier than the US average, but charging on it still makes 54% 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
396mi
At Denver's typical October day, 51°F · 35% highway
Winter lowEstimated
345mi
January, 32°F; Dec 19–25 at 31°F · lows near 17°F
Home chargingEstimated
$103/mo
8.9¢ a mile at 17.0¢/kWh. Gas Sierra: $297/mo
Denver's grid
1.04lb CO₂/kWh
WECC Rockies (EPA eGRID): 35% dirtier than the US, 54% less CO₂ than gas
Denver, 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 · 32°F
15% below its 410-mile rating · coldest week 345 mi
350mi
Spring Mar–May · 49°F
4% below its rating
393mi
Summer Jun–Aug · 72°F
4% above its rating
424mi
Fall Sep–Nov · 52°FNow
3% below its rating
396mi
A Sierra EV AT4 / Denali's range through a Denver yearEstimated
Each month at Denver's 30-year normal temperature, 35% highway. 29 days a year average below freezing.
How far it goes from Denver, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 178 mi out and back, 356 mi one way (January: 314 mi). Dots are DC fast chargers by network.
Fast charging around Denver
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 166DC fast chargers within 25 mi
- 0.8 mito the nearest
- ChargePoint153 in reach
- EVgo56
- Electrify America53
- Tesla Supercharger53
- EV Connect32
Road trips in October, about, by road: Colorado Springs (78 mi) one way on a charge; Albuquerque (420 mi) with one fast stop.
Questions Denver drivers ask
How far can a Sierra EV AT4 / Denali go in a Denver winter?
About 349 miles on a typical January day (32°F) and about 345 in the coldest week of the year (around December 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. Denver averages 29 days a year below freezing.
How much does it cost to charge a Sierra EV AT4 / Denali in Denver?
About $103 a month at home for 38 miles a day, at Colorado's average home electricity rate of 17.0¢/kWh: about 8.9¢ a mile. A gas Sierra on Denver's average gas ($4.24 a gallon) costs about $297 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in Denver?
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 Denver's grid?
Yes. Denver's grid (WECC Rockies) is 35% dirtier than the US average, but a Sierra EV AT4 / Denali charged on it still makes 54% 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 Denver
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Denver-Stapleton, CO; home electricity, EIA (Colorado, July 2026); gas, EIA weekly (Denver); 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.