Home / SF Bay Area / Winter 2026-27 / Half marathons

Winter half marathons near the Bay Area (2026-27)

22 half marathons on the calendar from December to February, starting with Peacock Gap Trail Run on Saturday December 5. 8 of them publish an upcoming price increase, so signing up early saves money.

All winter races5K races (28)10K races (25)Half marathons (22)Marathons (3)Ultramarathons (5)Trail races (12)

• Sat5Dec

  Peacock Gap Trail Run

  Sat Dec 5 · 8:30 AM · San Rafael · Marin

  10KHalf marathon19.5 milesTrail

  Reg. closed
• Sat12Dec

  Run for Breast Cancer 5K/10K/13.1 San Francisco

  Sat Dec 12 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat12Dec

  Sunrise Marathon 5K/10K/13.1 San Francisco

  Sat Dec 12 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat12Dec

  Summit Rock

  Sat Dec 12 · 8:30 AM · Saratoga · South Bay & San Jose

  5K10KHalf marathonTrail

  from $73Goes up Nov 8
• Sat19Dec

  Woodside Ramble

  Sat Dec 19 · 8:00 AM · Woodside · Peninsula

  10KHalf marathon23.1 miles50KTrail

  Reg. closed
• Sat26Dec

  A Merry Christmas Run 5K/10K/13.1 San Francisco

  Sat Dec 26 · 7:30 AM · San Mateo · Peninsula

  1 mile5K10KHalf marathon

  from $30
• Sat26Dec

  New Year's Run 5K/10K/13.1 San Francisco

  Sat Dec 26 · 7:30 AM · San Mateo · Peninsula

  1 mile5K10KHalf marathon

  from $30
• Fri1Jan

  Brazen New Year's Day

  Fri Jan 1 · 8:30 AM · Castro Valley · East Bay

  5K10KHalf marathonTrail

  from $73Goes up Dec 5
• Fri1Jan

  Brazen New Year's Eve

  Fri Jan 1 · 8:30 AM · Castro Valley · East Bay

  5K10KHalf marathonTrail

  from $68Goes up Oct 25
• Sat16Jan

  MLK Jr. Freedom Run 5K/10K/13.1 San Francisco

  Sat Jan 16 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sun17Jan

  Spasm Crystal Springs Trail Run

  Sun Jan 17 · 7:50 AM · Woodside · Peninsula

  5 milesHalf marathon22 milesMarathon50KTrail

  from $60Goes up Jan 11
• Sat30Jan

  Coffee Lover Run San Francisco

  Sat Jan 30 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat30Jan

  Coyote Hills

  Sat Jan 30 · 7:30 AM · Fremont · East Bay

  5K10KHalf marathon

  from $63Goes up Nov 9
• Sat30Jan

  Run for Donut San Francisco

  Sat Jan 30 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat6Feb

  Golden Gate Trail Run

  Sat Feb 6 · 7:50 AM · Sausalito · Marin

  2 miles8KHalf marathon30KMarathon50KTrail

  from $60Goes up Jan 31
• Sun7Feb

  Kaiser Permanente San Francisco Half Marathon & 5K

  Sun Feb 7 · San Francisco · San Francisco

  5K10KHalf marathon

  see site
• Sat13Feb

  Run for Chocolate 5K/10K/13.1 San Francisco

  Sat Feb 13 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat13Feb

  Valentine's Day Run 5K/10K/13.1 San Francisco

  Sat Feb 13 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat20Feb

  Montara Mountain Trail Run

  Sat Feb 20 · 7:45 AM · Pacifica · Peninsula

  2 miles10KHalf marathon20.7 milesMarathon50KTrail

  from $60Goes up Feb 14
• Sat20Feb

  Beer City Half™ Santa Rosa

  Sat Feb 20 · 8:30 AM · Santa Rosa · Napa & Sonoma

  1 mile5K10KHalf marathonTrail

  from $25Goes up Nov 23
• Sat27Feb

  Run For Mental Health San Francisco

  Sat Feb 27 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30
• Sat27Feb

  Run Together Against Breast Cancer San Francisco

  Sat Feb 27 · 7:30 AM · San Francisco · San Francisco

  1 mile5K10KHalf marathon

  from $30

• Fall 202650 races
• Spring 202736 races
• Summer 202717 races