Montgomery is the first running back to join the Nittany Lions' Class of 2023.
Washington was previously committed to Alabama since January 2022.
One week after UCLA and USC shocked the college sports world with a move to the Big Ten, two of our staffers debated its effect on Penn State.
Stokes flipped his commitment to Florida less than a month after the Nittany Lions lost an offensive lineman to Georgia.
"USC and UCLA are both synonymous with academic and athletics success and will be tremendous additions to our conference."
USC and UCLA will become the Big Ten's 15th and 16th teams beginning in 2024.