GMC · Full-size electric pickup
GMC Sierra EV bed dimensions & sizes by year
Buying a tonneau cover and not sure it'll fit? Pick your model year to get the exact bed length of your Sierra EV in inches — plus the covers built for it. No guesswork, no wrong-size returns.
Find your bed size in 10 seconds
The GMC Sierra EV has come in 1 bed length across 2024–2026:
Select your year above for the exact bed length that fits your truck.
Sierra EV bed dimensions: length, width & tailgate down
The numbers for the current Sierra EV (2024–present) in inches. Older generations are in the year-by-year table below.
| Measurement | Inches | What it means |
|---|---|---|
| Bed length — 5.9 ft | 70.6" | Floor, bulkhead to closed tailgate · Crew Cab |
| 5.9 ft bed, tailgate down | ≈ 89" | Approximate supported length with the tailgate dropped |
| Width between wheel wells | 50" | 4×8 sheets lie flat on the floor |
| Overall length | 233.1" | Bumper to bumper |
| Overall width | 81.6" · 96" with mirrors | Body without mirrors, then mirrors extended |
| Height | 78–78.7" | 2WD to 4WD / suspension options |
| Wheelbase | 145.7" | Front to rear axle |
Tailgate-down lengths assume the roughly 18 inches a dropped tailgate adds on a typical pickup. Off-road trims run wider and taller than the ranges above — measure your own truck before counting on a tight fit. Will it fit your garage? Sierra EV dimensions & garage fit →
Not sure which bed you have?
Two Sierra EVs from the same year can have different beds depending on cab. Don't trust the badge — measure it. It takes 30 seconds and saves a return.
- 1
Close the tailgate.
- 2
Put a tape measure on the bed floor against the bulkhead (the wall behind the cab).
- 3
Measure straight back to the inside of the closed tailgate.
- 4
Match that number to a bed length above — covers are sold by category (5.5 ft, 6.5 ft, 8 ft…), so round to the nearest one.
Sierra EV bed sizes & specs, year by year
Sierra EV · 1st gen
| Bed | Length | Inches | Cabs | |
|---|---|---|---|---|
| 5.9 ft | 5'11" | 70.6" | Crew Cab | Covers → |
- Cab styles
- Crew Cab
- Drivetrain
- AWD
- Max towing
- 12,500 lb
- Max payload
- 2,250 lb
- MSRP from
- $91,500 (launch)
Engines (2)
- Dual-motor AWD (Elevation/AT4) 625 hp · Electric
- Dual-motor AWD Max Range (Denali) 760 hp · 785 lb-ft · Electric
Cargo box length at floor 70.6 in (GMC markets it as the 5.9 ft class box) tailgate-up; this is what a tonneau fits. MultiPro Midgate drops the bulkhead/rear glass for ~10'10" (130 in) load-through. Crew Cab only; BT1 Ultium platform; mechanical twin of Silverado EV. Trims: Elevation, AT4, Denali. Factory/dealer powered tonneau; aftermarket tonneaus fit the 70.6-in box but conflict with the Midgate pass-through and the MultiPro tailgate's deployed functions. Max tow 12,500 lb.
What fits in a Sierra EV bed
Bed length in inches only means something once you know what it swallows. Here's how the loads people actually haul line up against every Sierra EV bed on record.
| Load | Needs | 5.9 ft · 70.6" |
|---|---|---|
| 4×8 ft sheet of plywood or drywall | 96" | Won't fit |
| 8 ft 2×4s and trim lumber | 96" | Won't fit |
| Full-size dirt bike | 85" | Tailgate down |
| Adult mountain bike, wheels on | 70" | Fits, tailgate up |
| Two-person truck bed tent | 60" | Fits, tailgate up |
| Standard 48×40 in shipping pallet | 48" | Fits, tailgate up |
"Tailgate down" assumes the roughly 18 inches a dropped tailgate adds on a typical pickup — measure yours before you count on it, and strap anything that overhangs. Width is the other half of the answer: a 48-inch sheet only lies flat on the bed floor when the wheel wells are more than 48 inches apart, otherwise it rides on top of the arches. For cubic feet of mulch, soil or gravel, run your dimensions through the bed volume calculator.
Volume is one limit, weight is the other. Check your Sierra EV's real payload → · what it can actually tow →
More Sierra EV specs
Bed size is one number among several. These carry the rest of the reference data for this truck specifically.
Other trucks with a Sierra EV-size bed
Cross-shopping, or checking whether a cover you already own could move to another truck? These pickups come in a bed within two inches of a Sierra EV bed.
Same length still isn't the same cover — rail height and bed-rail profile differ by truck. Confirm with the fitment checker before you buy or swap.
Tonneau covers that fit the Sierra EV
Not sure a cover will fit? Run the Sierra EV fitment checker → for your bed length, the cover types that fit, and any Sierra EV-specific gotchas.
Sierra EV bed size — frequently asked
What bed sizes does the GMC Sierra EV come in?
The GMC Sierra EV has been offered with 1 bed length: 5.9 ft (70.6"). The exact bed on your truck depends on its model year and cab — choose your year above to see which covers fit.
How wide is the Sierra EV bed?
On the current Sierra EV (2024–present) the bed floor measures about 50 inches between the wheel wells — the narrowest point and the number that decides what lies flat. That is wider than 48 inches, so a 4×8 sheet of plywood or drywall lies flat on the floor. The bed is wider above and behind the arches; measure your own truck before counting on a tight fit.
How long is the Sierra EV bed with the tailgate down?
The current Sierra EV bed measures 70.6" (5.9 ft) with the tailgate closed. Dropping the tailgate adds roughly 18 inches of support on a typical pickup, so plan on about 89" of load floor with it down. Tailgates vary by a couple of inches — measure yours, and strap anything that overhangs.
How long is a Sierra EV overall?
The current Sierra EV is 233.1" long bumper to bumper, 81.6" wide without mirrors and 78–78.7" tall. Check the garage fit before you buy — mirrors and off-road trims add width and height.
How do I measure my Sierra EV bed length?
Measure the inside floor of the bed, from the bulkhead (the wall behind the cab) to the inside of the closed tailgate. Round to the nearest standard size — tonneau covers are sold by bed-length category (e.g. 5.5 ft, 6.5 ft, 8 ft), not the exact inch.
What bed length options does the 2026 Sierra EV have?
The current Sierra EV (2024–present) comes with 5.9 ft (70.6") on the Crew Cab. There is only one bed length in this generation, so every current truck takes the same size cover.
Will a tonneau cover from an older Sierra EV fit a newer one?
Not necessarily. Covers are matched to a specific generation and bed length, and both the bed length and the rail design can change between generations. Always match your exact model year and bed size before buying — the year-by-year table below shows where the Sierra EV changed.
Will a 4×8 sheet of plywood fit in a Sierra EV?
No. Even the longest Sierra EV bed (70.6") plus a dropped tailgate falls short of 96 inches, so an 8 ft sheet will overhang and needs a flag and proper tie-downs. Width matters too: a 48-inch sheet only lies flat on the floor if the gap between the wheel wells is wider than 48 inches — on mid-size trucks it rides on top of the wheel arches instead.
How much can a Sierra EV tow?
Properly equipped, the Sierra EV has been rated up to 12,500 lb across the generations on this page, with a maximum payload of about 2,250 lb. Those are best-case figures for a specific engine, cab and axle combination — your truck's door-jamb sticker and owner's manual are the numbers that count. Run them through the towing and payload calculators to see what's actually left for a trailer once passengers and gear are on board.
What cab configurations does the Sierra EV come in?
The Sierra EV has been offered as Crew Cab. Cab choice is what usually decides bed length — a bigger cab on the same wheelbase means a shorter bed, which is why two trucks from the same year can need different covers.
Does a tonneau cover on a Sierra EV improve gas mileage?
A little, and only at highway speed. Independent testing puts the gain on a typical pickup at roughly 1–2%, which is real but small — on most Sierra EV trucks that's a few dollars a tank, not a payback plan. Buy a cover for the dry, locked, secure bed; treat the mileage as a bonus.
