* Full-size spare: If it has a full-size spare, it's usually located underneath the vehicle, accessed by a panel in the rear cargo area. You'll likely need to remove some carpeting or a storage cover to find the access panel.
* Temporary/Compact spare: If it has a temporary spare, it's also usually underneath the vehicle, but the access is the same as above.
To be certain, check your owner's manual. It will have a diagram showing the exact location and instructions on how to access and use the spare tire.