Reality Check · Portland, OR
2026 GMC Sierra EV AT4 / Denali in Portland, OR
Winter range, charging cost and how far it goes, worked out for Portland's weather, grid and prices.
Winter barely touches range in Portland: at a typical January's 42°F, a Sierra EV AT4 / Denali gets an estimated 383 miles on a charge, within 7% of its 410-mile rating. Charging at home at Oregon's average rate (16.0¢/kWh) costs about $94 a month for 38 miles a day, about a third of the $351 a gas Sierra costs on the West Coast's gas. And Portland's grid (WECC Northwest), 18% cleaner than the US average, makes it 73% 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
402mi
At Portland's typical October day, 56°F · 35% highway
Winter lowEstimated
381mi
January, 42°F · lows near 36°F
Home chargingEstimated
$94/mo
8.1¢ a mile at 16.0¢/kWh. Gas Sierra: $351/mo
Portland's grid
0.63lb CO₂/kWh
WECC Northwest (EPA eGRID): 18% cleaner than the US, 73% less CO₂ than gas
Portland, 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 · 43°F
6% below its 410-mile rating · coldest week 381 mi
384mi
Spring Mar–May · 54°F
About its rating
399mi
Summer Jun–Aug · 68°F
About its rating
419mi
Fall Sep–Nov · 56°FNow
About its rating
402mi
A Sierra EV AT4 / Denali's range through a Portland yearEstimated
Each month at Portland's 30-year normal temperature, 35% highway. No day of the year averages below freezing.
How far it goes from Portland, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 181 mi out and back, 362 mi one way (January: 345 mi). Dots are DC fast chargers by network.
Fast charging around Portland
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 131DC fast chargers within 25 mi
- 0.7 mito the nearest
- ChargePoint206 in reach
- Tesla Supercharger137
- Electrify America91
- EVCS77
- EVgo59
Road trips in October, about, by road: Spokane (360 mi) and Seattle (181 mi) one way on a charge; Boise (429 mi) with one fast stop.
Questions Portland drivers ask
How far can a Sierra EV AT4 / Denali go in a Portland winter?
Portland's winters are mild: about 383 miles on a typical January day (42°F) and about the same in the coldest week (around December 22, 41°F), estimated from real EV drives at those temperatures. That's within 7% of its 410-mile rating.
How much does it cost to charge a Sierra EV AT4 / Denali in Portland?
About $94 a month at home for 38 miles a day, at Oregon's average home electricity rate of 16.0¢/kWh: about 8.1¢ a mile. A gas Sierra on the West Coast's average gas ($5.01 a gallon) costs about $351 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in Portland?
Not at 38 miles a day: a 120 V outlet adds only about 31 miles in 12 hours on an average day (29 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 hours.
Is it greener to drive electric on Portland's grid?
Yes, more than most places. Portland's grid (WECC Northwest) is 18% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 73% 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 Portland
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Portland International Airport, OR; home electricity, EIA (Oregon, July 2026); gas, EIA weekly (the West Coast); 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.