Front wipers are 26 inches on the driver’s side and 20 inches on the passenger’s side, with a 12-inch rear wiper.
For the 2020 Sienna, these sizes are standard across most trim levels, but it’s always a good idea to confirm by checking the owner’s manual or the retailer listing, as aftermarket blade designs may vary in attachment style or blade type.
Front wiper blade sizes
The following sizes cover the front windshield on the 2020 Toyota Sienna. These measurements reflect common OEM and aftermarket replacements and apply to most trims of this model year.
- 26 inches — Driver-side blade
- 20 inches — Passenger-side blade
When replacing the front blades, ensure the length matches the windshield’s swept area and that the connector is compatible with your wiper arm. If the blade backings or adapters differ, you may need a universal adapter kit or a blade designed for Toyota vehicles.
Rear wiper blade size
The Sienna’s rear window uses a single blade measuring 12 inches on most 2020 models.
- 12 inches — Rear blade
Rear blade replacement typically involves lifting the wiper arm away from the glass, rotating the blade holder to unlock it, and sliding the old blade out before snapping in a new one. Check the owner's manual for the exact removal method for your blade style.
Verification tips
To ensure accuracy, measure the blades yourself or bring the old blade to the store as a sample. Product descriptions or packaging at retailers will often list the correct lengths. If shopping online, search for 2020 Toyota Sienna wiper blades and confirm that the front blades are listed as 26" and 20" and the rear as 12".
Summary
For a 2020 Toyota Sienna, plan for front wipers of 26" (driver) and 20" (passenger) plus a 12" rear blade. Always verify with your manual or parts retailer, and consider blade type (beam vs. conventional) and winter-specific options if you drive in harsh conditions.