Reality Check · Honolulu, HI
2026 GMC Sierra EV AT4 / Denali in Honolulu, HI
Winter range, charging cost and how far it goes, worked out for Honolulu's weather, grid and prices.
Winter barely touches range in Honolulu: at a typical January's 74°F, a Sierra EV AT4 / Denali gets an estimated 427 miles on a charge, within 4% of its 410-mile rating. Power is pricey in Hawaii (48.0¢/kWh), so charging at home costs about $265 a month for 38 miles a day, still less than the $351 a gas Sierra costs on the West Coast's gas. Honolulu's grid (HICC Oahu) is 94% dirtier than the US average, but charging on it still makes 40% 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 range
425mi
At Honolulu's typical October day, 80°F · 35% highway
Winter low
427mi
January, 74°F · lows near 67°F
Home chargingEstimated
$265/mo
22.9¢ a mile at 48.0¢/kWh. Gas Sierra: $351/mo
Honolulu's grid
1.49lb CO₂/kWh
HICC Oahu (EPA eGRID): 94% dirtier than the US, 40% less CO₂ than gas
Honolulu, 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 · 74°F
4% above its rating · coldest week 427 mi
428mi
Spring Mar–May · 77°F
5% above its rating
429mi
Summer Jun–Aug · 81°F
3% above its rating
423mi
Fall Sep–Nov · 80°FNow
4% above its rating
425mi
A Sierra EV AT4 / Denali's range through a Honolulu yearEstimated
Each month at Honolulu's 30-year normal temperature, 35% highway. No day of the year averages below freezing.
How far it goes from Honolulu, on real roads
In October, from a full charge with 10% in reserve: about 191 mi out and back, 382 mi one way (January: 384 mi). Dots are DC fast chargers by network.
Fast charging around Honolulu
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 42DC fast chargers within 25 mi
- 1.5 mito the nearest
- OpConnect19 in reach
- Shell Recharge11
- Electrify America3
- EV Connect2
- Tesla Supercharger2
Questions Honolulu drivers ask
How far can a Sierra EV AT4 / Denali go in a Honolulu winter?
Honolulu's winters are mild: about 427 miles on a typical January day (74°F) and about the same in the coldest week (around January 15, 74°F), estimated from real EV drives at those temperatures. That's within 4% of its 410-mile rating.
How much does it cost to charge a Sierra EV AT4 / Denali in Honolulu?
About $265 a month at home for 38 miles a day, at Hawaii's average home electricity rate of 48.0¢/kWh: about 22.9¢ 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 Honolulu?
Not at 38 miles a day: a 120 V outlet adds only about 33 miles in 12 hours on an average day (33 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 hours.
Is it greener to drive electric on Honolulu's grid?
Yes. Honolulu's grid (HICC Oahu) is 94% dirtier than the US average, but a Sierra EV AT4 / Denali charged on it still makes 40% 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 Honolulu
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Honolulu International Airport, HI; home electricity, EIA (Hawaii, 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.