How Do Car Seats Fit in a 2020 GMC Sierra 1500?

gmc-sierra-2020-csc-scorecard.png graphic by Melissa Galicia Vega |

The verdict: It’s hard to beat a full-size pickup truck when it comes to hauling the kiddos, and the 2020 GMC Sierra 1500 crew cab proves our point, earning nearly all A’s in our Car Seat Check. It also fit our three car seats across its spacious backseat.

Does it fit three car seats? Yes

gmc-sierra-2019-csc-fits-three.jpg 2020 GMC Sierra | photo by Jenni Newman

Take a look at how the Latch system and each car seat scored below in our Car Seat Check of the 2020 GMC Sierra 1500.

Related: Search Car Seat Checks

Grade A

  • Latch system: The GMC Sierra 1500 has two sets of lower Latch anchors in the outboard seats, which were easy to connect to. It has three tether anchors behind the head restraints. To use the tether anchors, you’ll need to run the tether strap through the tether loop directly behind your car seat and then connect the tether strap to the tether anchor found behind the seat next to your car seat. It can be confusing, so check the owner’s manual for more info.
  • Infant seat: This rear-facing car seat installed easily in the Sierra 1500 and fit well. There’s so much rear legroom that we didn’t need to move the front passenger seat forward to accommodate the car seat.
  • Rear-facing convertible seat: This car seat was a breeze to install thanks to its rigid Latch connectors; legroom was not an issue.

Grade B

  • Forward-facing convertible seat: The tether setup can be a little tricky in the Sierra 1500 (and all full-size pickup trucks with a crew cab), but other than that, the forward convertible installed easily.
  • Booster: Our high-back booster seat fit well on the GMC Sierra’s wide rear seats. We install the booster seat behind the driver’s seat. In the Sierra, the seat belt buckle in that position has a long, floppy strap, making it difficult for little ones to use on their own. The other rear seat belt buckles are on stable bases, which may be easier for your child to use.

Grade C

  • None

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2019 GMC Sierra 1500 SLE
54,581 mi.
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About’s Car Seat Checks

Editors Jennifer Geiger, Jennifer Newman and Matt Schmitz are certified child safety seat installation technicians.

For the Car Seat Check, we use a Graco SnugRide Classic Connect 30 infant-safety seat, a Britax Marathon convertible seat and Graco TurboBooster seat. The front seats are adjusted for a 6-foot driver and a shorter passenger. The three child seats are installed in the second row. The booster seat sits behind the driver’s seat, and the infant and convertible seats are installed behind the front passenger seat.

We also install the forward-facing convertible in the second row’s middle seat with the booster and infant seat in the outboard seats to see if three car seats will fit; a child sitting in the booster seat must be able to reach the seat belt buckle. If there’s a third row, we install the booster seat and a forward-facing convertible. Learn more about how we conduct our Car Seat Checks.

Parents should also remember that they can use the Latch system or a seat belt to install a car seat, and that Latch anchors have a weight limit of 65 pounds, including the weight of the child and the weight of the seat itself.’s Editorial department is your source for automotive news and reviews. In line with’s long-standing ethics policy, editors and reviewers don’t accept gifts or free trips from automakers. The Editorial department is independent of’s advertising, sales and sponsored content departments.

Photo of Jennifer Newman
Editor-in-Chief Jennifer Newman is a journalist with more than 25 years of experience, including 15 years as an automotive journalist at Jennifer leads the Editorial team in its mission of helping car shoppers find the vehicle that best fits their life. A mom of two, she’s graduated from kids in car seats to teens behind the steering wheel. She’s also a certified car-seat technician with more than 12 years of experience, as well as member of the World Car Jury, Automotive Press Association and Midwest Automotive Media Association. LinkedIn: Instagram: @jennilnewman Email Jennifer Newman

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