Reality Check · Boise, ID
2026 GMC Sierra EV AT4 / Denali in Boise, ID
Winter range, charging cost and how far it goes, worked out for Boise's weather, grid and prices.
Boise's winters are cool rather than cold: on a typical January day (32°F) a Sierra EV AT4 / Denali gets an estimated 350 miles, 15% under its 410-mile rating, and about 344 in the coldest week (around December 24, when it averages 31°F). By June it's back to about 419. Charging at home at Idaho's average rate (13.7¢/kWh) costs about $82 a month for 38 miles a day, about a third of the $313 a gas Sierra costs on the Rocky Mountains's gas. And Boise's grid (WECC Northwest), 18% cleaner than the US average, makes it 72% 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
399mi
At Boise's typical October day, 53°F · 35% highway
Winter lowEstimated
344mi
January, 32°F; Dec 24–30 at 31°F · lows near 24°F
Home chargingEstimated
$82/mo
7.1¢ a mile at 13.7¢/kWh. Gas Sierra: $313/mo
Boise's grid
0.63lb CO₂/kWh
WECC Northwest (EPA eGRID): 18% cleaner than the US, 72% less CO₂ than gas
Boise, 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 · 52°F
3% below its rating
397mi
Summer Jun–Aug · 74°F
4% above its rating
426mi
Fall Sep–Nov · 53°FNow
About its rating
398mi
A Sierra EV AT4 / Denali's range through a Boise yearEstimated
Each month at Boise's 30-year normal temperature, 35% highway. 33 days a year average below freezing.
How far it goes from Boise, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 179 mi out and back, 359 mi one way (January: 315 mi). Dots are DC fast chargers by network.
Fast charging around Boise
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 16DC fast chargers within 25 mi
- 2.2 mito the nearest
- ChargePoint42 in reach
- Tesla Supercharger25
- Electrify America17
- EVgo15
- Shell Recharge10
Road trips in October, about, by road: Ogden (340 mi) one way on a charge; Spokane (359 mi) with one fast stop.
Questions Boise drivers ask
How far can a Sierra EV AT4 / Denali go in a Boise winter?
About 350 miles on a typical January day (32°F) and about 344 in the coldest week of the year (around December 24, 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. Boise averages 33 days a year below freezing.
How much does it cost to charge a Sierra EV AT4 / Denali in Boise?
About $82 a month at home for 38 miles a day, at Idaho's average home electricity rate of 13.7¢/kWh: about 7.1¢ a mile. A gas Sierra on the Rocky Mountains's average gas ($4.47 a gallon) costs about $313 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in Boise?
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 Boise's grid?
Yes, more than most places. Boise's grid (WECC Northwest) is 18% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 72% 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 Boise
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Boise Air Terminal, ID; home electricity, EIA (Idaho, July 2026); gas, EIA weekly (the Rocky Mountains); 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.