I’m wondering if the pool at the Vero Beach Resort is heated. Also, is the ocean temp warm enough for swimming in early March?

Yes the pool is heated. It’s like bath water. The ocean is chilly but tolerable.

I've been there in February and the pool was warmer than the air temperature. Also, they have a hot tub.

Yes the ocean is warm you just have to watch out for rip current

Pool is not heated but very refreshing especially when the temperatures are in the high 80s. The ocean is the Atlantic so it can be chilly in March depending on what you're used to.