If you need an open track in Borås; Ryavallen is marked as open to the public.
Running in a new city in the winter time can be tricky. Bad weather and darkness makes it hard to find good places to run.
For hardcore track runners who wants to workout on an indoor track; try Ryahallen.
Ramnasjön has lighting.
Byttorpssjön has a soft surface for those who like to avoid the asphalt and concrete.