(see attached pdfs)
From CU Athletics:
Parking on campus for games is roughly $20 depending on the lot. I have attached a parking map for you to help navigate. The legend in the bottom left corner lists price and location. Parking lots open 4 hours before kick-off so there is some flexibility in when you need to arrive although the sooner you head into town the less traffic you will face! If you are coming to Boulder from Denver and US 36 West, you can exit on Baseline, take a left onto Baseline, and you will be able to turn right onto Broadway- the main road on the map.
The Cal tailgating lot is Lot 308, which is off Broadway and Regent Dr. To park near there, I would recommend Lot 327 if possible.