As others have stated, it depends on the sport, the athlete, and the coaches.
I knew a young lady who actually did 3 D-I sports in college, and made 2nd team All-American in one of the sports. She did cross-country in the fall, indoor track in the winter, and outdoor track in the spring. Nike offered her a job as a professional runner, but she turned them down. Ah, but those 3 sports are all so very similar.
My DS, on the other hand, found he could only do ONE sport at a high level even at a D-III school. He rows at one of the top D-III rowing programs in the US (Milwaukee School of Engineering). In order to be one of the very top rowers at the school, he not only practices early morning every day, but works out in the gym a couple of hours every afternoon. That is what he needs to do to stay on top. He told me his track times were good enough for his school's track team. He used to play intramural Ultimate, and the captain of the Ultimate club offered him a spot on the roster his freshman year. He gave up the intramural sports when he moved out of the dorms. Basically, the only sport he can do at a high level is rowing. He will do stuff like bike riding for fun, but not competitively.
Most programs these days go all year round. For example, my DS' D-III rowing team goes all year round. He wouldn't have time for another sport.
I think there are a few very speedy college football players who also run track in the spring.
Multiple sports in college used to be much more common. Jim Thorpe was great at everything, was perhaps the best track and field athlete of all time, played baseball for the NY Giants, and was one of the founders of the NFL. Jackie Robinson did 3 D-I varsity sports. O.J. Simpson once had a world record in track, and carried the US flag in the 1968 Olympics.
I knew a young lady who actually did 3 D-I sports in college, and made 2nd team All-American in one of the sports. She did cross-country in the fall, indoor track in the winter, and outdoor track in the spring. Nike offered her a job as a professional runner, but she turned them down. Ah, but those 3 sports are all so very similar.
My DS, on the other hand, found he could only do ONE sport at a high level even at a D-III school. He rows at one of the top D-III rowing programs in the US (Milwaukee School of Engineering). In order to be one of the very top rowers at the school, he not only practices early morning every day, but works out in the gym a couple of hours every afternoon. That is what he needs to do to stay on top. He told me his track times were good enough for his school's track team. He used to play intramural Ultimate, and the captain of the Ultimate club offered him a spot on the roster his freshman year. He gave up the intramural sports when he moved out of the dorms. Basically, the only sport he can do at a high level is rowing. He will do stuff like bike riding for fun, but not competitively.
Most programs these days go all year round. For example, my DS' D-III rowing team goes all year round. He wouldn't have time for another sport.
I think there are a few very speedy college football players who also run track in the spring.
Multiple sports in college used to be much more common. Jim Thorpe was great at everything, was perhaps the best track and field athlete of all time, played baseball for the NY Giants, and was one of the founders of the NFL. Jackie Robinson did 3 D-I varsity sports. O.J. Simpson once had a world record in track, and carried the US flag in the 1968 Olympics.