Course
20km Course Map
Boston Buildup Winter Series
- Date
- Last held Jan 4, 2026, next date to be announced
- Location
- Various, Connecticut
View on RunSignup
Registration for the next edition has not opened.
We earn a small commission when you register through this link, at no cost to you. Details
2026 results
All resultsRowayton 10k
201
finishers
51:25
median (8:16 /mi)
32:45
winning time
40% / 60%
women / men
FAIRFIELD 15k
134
finishers
1:13:15
median (7:52 /mi)
54:55
winning time
38% / 62%
women / men
Silvermine 25k
108
finishers
2:09:21
median (8:20 /mi)
1:25:00
winning time
33% / 67%
women / men
Aggregated from official results (Club Connecticut) for Boston Buildup Winter Series. Individual finisher names are not stored here.
How fast do you need to be at Boston Buildup Winter Series?
At the 2026 Rowayton 10k, the fastest tenth finished in 42:23 or better, the top quarter in 47:01, and half the field in 51:25; the last tenth came in after 1:08:25.
At the 2026 FAIRFIELD 15k, the fastest tenth finished in 1:03:02 or better, the top quarter in 1:08:17, and half the field in 1:13:15; the last tenth came in after 1:29:54.
At the 2026 Silvermine 25k, the fastest tenth finished in 1:50:09 or better, the top quarter in 1:59:51, and half the field in 2:09:21; the last tenth came in after 2:38:50.
| Age | Women | Men |
|---|---|---|
| 20-29 | 52:37 | 49:59 |
| 30-39 | 44:40 | 35:00 |
| 40-49 | 46:56 | 41:21 |
| 50-59 | 49:29 | 40:29 |
| 60-69 | 56:47 | 45:58 |
| 70+ | n/a | 1:06:23 |
Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.
What would my time get me?
Where a finish time would have placed in 2026.
How fast is it?
Faster than most Connecticut 10Ks
The fastest quarter of the 2026 10K field finished under 47:01, against 50:52 in a typical Connecticut 10K, so times here run 8 percent faster.
- 15K: Faster than most US 15Ks. The fastest quarter of the 2026 15K field finished under 1:08:17, against 1:20:57 in a typical US 15K, so times here run 16 percent faster.
Compares the fastest quarter of each field, so walkers and first-timers do not skew it. It reflects the course and the field together: a flat course, cool weather, or a competitive crowd all make times faster.
From the race's page
What the organizers of Boston Buildup Winter Series cover on their registration page, in brief.
Parking and travel
25km Parking
Alternate parking locations for Silvermine 25km.
Race details
- Where
- Various, Various, CT 99999
- Course
- Road
- Distances
- 10K, 15K, Other
- Editions
- 2026 (Jan 4, 2026)
- Status
- The next edition has not been announced yet. Past events: 4-Race Series, Rowayton 10k, FAIRFIELD 15k, Fairfield 20k, Silvermine 25k.
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is Boston Buildup Winter Series?
- The next date has not been announced.
- How much does it cost?
- See the registration page for current pricing.
- What distances can I run?
- 10K, 15K, Other.
- How big is it, and how fast?
- In 2026, 201 runners finished the Rowayton 10k; the median finish was 51:25 and the winner ran 32:45.
- Is it a fast course?
- The fastest quarter of the 2026 10K field finished under 47:01, against 50:52 in a typical Connecticut 10K, so times here run 8 percent faster.
- Where does it start?
- Various, Various, CT 99999.
From the organizers
A series of four progressively longer races. Now in its 48th year, this edition will include modifications to accommodate pandemic restrictions and guidelines.
You may register for any of the four individual events or for the full four-race Series. The first 125 Series registrants will receive custom Buildup socks, to be distributed prior to or at the first race.Commemorative long sleeve technical shirts available for purchase for Series or individual race entrants.