The Carlsbad 5000, is a popular 5k and 20k (more on that in a bit) run that happens annually in Carlsbad, California. The event, which is put on by the same group that hosts the nation wide Rock 'n' Roll series of races features a very fast and flat 5k road course.
Participants looking for something a bit longer can opt to run the "all day 20k" which is actually four separate 5k races back to back to back to back.
This is a popular event that regularly attracts thousands of runners each year!
The Carlsbad 5000 5k course is a fast oceanfront course with a slight uphill section and long running gradual downhill.