Mount Shasta's girls swept the top four places, and the boys went 2-3-4 in the 5K Henley Invitational cross country races Tuesday in Henley, Ore.
Both teams finished in first place in a small field.
All the Bears who ran the course two years ago improved their times, according to coach Steve Nesheim.
Senior Michael Cook showed the most improvement, placing second overall in 17 minutes and 52 seconds, 1:41 better than his time in 2010.
Cook finished 0:01 ahead of freshman teammate Chris Morzenti, who ran the fastest 5K pace of his short high school career.
Senior Chris Cazneaux improved his time on the Henley course by 52 seconds, finishing 4th in 18:18.
Senior Ellen Sampson led the girls race from start to finish. Her winning time of 21:08 was 26 seconds better than her previous best on the course.
Seniors Julie Ostrowski and Janelle Jaegel both ran their fastest 5K times ever to place 2nd and 3rd, respectively.
Ostrowski's 21:57 finishing time was 23 seconds per mile better than her previous 5K best. Jaegel improved her Henley course time by 37 seconds.
Junior Kelsie Titus placed 4th in 22:59.
Senior Katherine Holst was 8th in 24:51, bettering her course record by 24 seconds.
Sophomore Tamera Howell ran her fastest 5K ever by 24 seconds per mile to finish 9th in 25:19.
After placing 2nd in the Henley meet two years ago, Mount Shasta's girls ran away with the victory Tuesday, finishing with 18 points to Henley's 39.
Nesheim said Mount Shasta's boys team was "very young" two years ago when it placed 4th at the Henley meet.
They had 31 points Tuesday to finish ahead of Henley's 36 and Mazama's 62.
Nesheim said the boys appear "to have come of age and are ready to challenge the teams we meet."
Junior Sean Hughes placed 10th for the boys in 20:13, improving his time on the course by 31 seconds.
Junior Tommy Hake's "strong race sealed the team victory," according to Nesheim. He finished 13th in 21:03, improving his course record by 16 seconds.
Senior Garrett Shea ran his fastest 5K pace of the season and finished 17th in 22:29.
In the JV races, senior Keith Ramshaw and sophomore Krystal Rubio had their fastest paces of the season.
Next on the Bears' schedule is the State of Jefferson Invitational Oct. 6 at Lithia Park in Ashland.