Yes, you can refinance jumbo loans in the same way you can refinance a conforming loan. Like other types of mortgage rates, jumbo loan refinance rates fluctuate, and it could make sense to refinance if rates are now lower than when you took out your original loan.
Often, the same lender who originated your jumbo mortgage loan will also be able to refinance it for you. Still, it’s not a bad idea to get quotes from
other lenders
to see how their rates compare.