The female is a junior at CSU and was transported to a hospital shortly after the accident.
The incident was non-life threatening, officials said.
Heather Zobel, a CSU freshman, saw the tree branches fall on her fellow student.
"It was big," said Zobel, describing the diameter of the tree with her hands, which were spread wider than her head. "And it came down, and the branches went all over, too. It was really bad."
Across Fort Collins, trees lay on cars and sidewalks - and even homes on Wednesday.
At the Poudre Valley Mobile Home Park, trees seemed to be everywhere: on the roads, over porches, and through roofs.
Mayra Flores and her family sat inside their mobile home Wednesday morning. To look up at the roof was to see two basketball-sized windows to the sky. That's where trees punctured her roof Tuesday night.
"It felt like an earthquake," said Flores, who on Tuesday night shielded herself and her young son as she put him to bed and heard the noises. "All the branches started coming down through the roof."
Leonardo Wolfson contributed to this report.
(KUSA-TV © 2011 Multimedia Holdings Corporation)