That means Hirschman won't be able to compete with Connor Wood, a Texas transfer, for the starting job. Hirschman was recovering from offseason foot surgery when he hurt his other foot.
From a press release: "[Hirschman] broke the exact same metatarsal bone in his other foot over the weekend (he was walking and just stepped on it wrong, he was not in any athletic activity or conditioning); he flew home to California today where he will have surgery later in the week."
Hirschman started one game last season -- against Arizona State -- but there is strong sentiment that Wood is the frontrunner to replace Tyler Hansen.
Colorado holds its first practice Saturday.
Some more notes:
The Buffaloes will use a 4-3 defense after using a 3-4 -- officially -- much of last year. The No. 1 defensive line goes like this: Will Pericak and Eric Richter at the DTs and Juda Parker and Chidera Uzo‐Diribe at the ends.
The spring game is April 14 at Folsom Field.