The idle Buffaloes jumped to No. 21 in the Associated Press poll and No. 20 in the Amway Coaches poll.
Last week, the Buffs were No. 23 in both polls.
CU (6-2, 4-1 Pac-12) is ranked among the top 20 in one of the national polls for the first time since Sept. 7, 2003, when the Buffs were No. 17 in both polls.
This is the first time CU has been ranked in consecutive weeks since late in the 2005 season.
The Buffs will return to the field on Thursday, when UCLA (3-5, 1-4) visits Folsom Field.
They enter this week in sole possession of first place in the Pac-12 South Division, a half game ahead of No. 16 Utah (7-2, 4-2) and unranked Southern California (5-3, 4-2).
USC knocked handed the Buffs their only conference loss, 21-17, on Oct. 8. CU will host Utah in the regular season finale on Nov. 26.
Contact staff writer Brian Howell at firstname.lastname@example.org or twitter.com/BrianHowell33.