Annadel Half Marathon
Race Date
Apr 18, 2026
Location
Santa Rosa, CA
Quick facts
- Date
- Saturday, April 18, 2026
- Location
- Santa Rosa, California
- Distance
- Half marathon (13.1 mi) + 10K, 5K trail run
- Course
- Loop Course
- Terrain
- Trail
- USATF certified
- Not listed
- Finishers on record
- 2,896
Course Info
Course Type
Loop Course
Terrain
trail
Difficulty
Rolling Hills
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Quality Score
Standout6913 years running
~120 finishers a year
shrinking
25% returning runners
3 timing sources · 4 photos
runners from 3 states
winner 1:38:59
typical high 68°F
Race Day Weather
5-year historical avgStart (Low)
45°
Afternoon (High)
68°
Pleasant conditions — light layers at start, comfortable by finish
0.1"
Precipitation
9 mph
Wind
74%
Humidity
Historical Finish Times
How 2,896 finishers actually crossed the line across 13 years.
Most recent
2026
Total finishers
2,896
Median time
2:24:16
Latest turnout
118
States
22
Turnout by year
2016–2026
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the Annadel Half Marathon?
The Annadel Half Marathon is held on Saturday, April 18, 2026.
Where does the Annadel Half Marathon take place?
It takes place in Santa Rosa, California.
What distances does the Annadel Half Marathon offer?
The half marathon (13.1 miles), plus 10K, 5K trail run.
Is the Annadel Half Marathon course flat and good for a PR?
The Annadel Half Marathon is a rolling hills, loop course course.
How many people run the Annadel Half Marathon?
HalfRuns has finish records for 2,896 runners who have completed the Annadel Half Marathon.
HalfRuns editorial — independent, no paid placement.
Explore More Journeys
Can't make it to Santa Rosa? Discover other experiences that match your running style.
Search All Races
