Shamrock'n 10K — F70-74: Guynn rules the 70s with a commanding wire-to-wire effort

• Lori Guynn wins in 1:07:38 — a 10:53/mi pace that put more than eight and a half minutes between her and second place.
• Kora Bitcon claimed second in 1:16:14, while Karin Boston and Rosa Mitchell battled tightly for the final podium spot — finishing just 23 seconds apart (1:21:49 vs. 1:22:12), with Mitchell actually gaining ground in the back half.
• Nancy Landers and Cindy Monroe staged the group's closest finish, separated by only 34 seconds across 6.2 miles (1:31:11 vs. 1:31:45).
• Eleven women aged 70–74 toed the line in West Sacramento on a cool, clear March morning — and every single one of them finished.

Lori Guynn, 72, of Davis, was never seriously challenged. She crossed in 1:07:38 at a steady 10:53/mi, a margin so decisive that second place was still more than eight minutes back. Her second-half split ranked 354th among all women on the 5K-to-finish segment — a strong back-half showing that confirmed she didn't coast home.

Behind Guynn, Kora Bitcon (71, Sacramento) ran a composed 1:16:14 at 12:16/mi to lock up second. The real drama unfolded for third: Karin Boston and Rosa Mitchell were separated by just 23 seconds at the finish, but Mitchell (1:22:12, 13:14/mi) was the one closing — her gender place actually improved in the second half, while Boston faded slightly. Boston held on for third in 1:21:49, but Mitchell made it interesting.

The 1:31 cluster added another subplot. Nancy Landers (74, Sacramento) finished fifth in 1:31:11 at 14:41/mi, with Cindy Monroe (70, San Jose) just 34 seconds later in 1:31:45. Robin Hintze (74, Grass Valley) was close behind in 1:32:49, making three finishers within 98 seconds of each other in that mid-pack stretch. Martha Torres-Montoya (73) finished eighth in 1:34:54, Lucy Pratt (70) ninth in 1:36:51, Barbara Ward (74) tenth in 1:43:44, and Beverly Shimizu (70) rounded out the group in 1:46:01 — every one of them earning a finish on a breezy St. Patrick's Day weekend morning.