Mr Trump is blitzing the state with five rallies while Mrs Clinton is also swinging through the Sunshine State.
Early voting by mail began in Florida weeks ago, with over a million people having already cast their votes.
Mrs Clinton holds a narrow three-point lead over Mr Trump in Florida, according to a new CBS/YouGov poll.
The former secretary of state had 46% of the vote compared with Mr Trump’s 43%, the poll found.
Mr Trump, who spent the weekend in Florida, was slated to appear at more campaign stops across the state before heading to North Carolina on Tuesday.
“We are going to win the great state of Florida and we are going to win back the White House,” Mr Trump said at a rally on Sunday in Naples.
