"Arizona State offered me today," said Stills. "That's my ninth."
A Scout 300 member, Stills is a four-star prospect by Scout.com.
Last month, he was named to the All-Camp team at the Badger/Scout 7on7 Tournament and will be at the Scout.com Combine next month in Los Angeles.
Stills helped lead La Costa Canyon to the CIF-San Diego Section D-I championship, leading all of San Diego in receiving yards with 1,274 on 64 receptions and scored 16 touchdowns. He was named First Team All-State Underclass by GoldenStatePreps.com.