Race day on this page is Oct 11, 2026.
MarathonForecasts live
City of Trees
Sunday, October 11, 2026Boise, Idaho, USA
Goal time
3:15:00
Adjusted time (preview)
3:15:30–3:17:00
Up to +2 min slower
Moderate conditions. Main factor: several factors. Get your personalised finish time and split-by-split pacing plan with Race Pass.
Based on the forecast, 3 days out.
About 125 m of climbing and 125 m of descent. Rolling.
Almost all within 2%No grades over 6%Two climbs
Impacts
Based on the forecast, 3 days out.
Elevation
Low impact
≤1%
Heat
Low impact
≤1%
Wind
Low impact
≤1%
Total Impact
Moderate impact
1–3%
Pace Opportunity
Moderate
ChallengingModerateFavorable
Race Pass: personalised finish time, adjusted splits, and your race-day pacing plan.
Race Day Forecast
The live outlook for this start.
9°C
Feels like 8°C
Race start: 7°C → 11°C
Forecast: cold, overcast, with moderate winds
Race Day Pacing
Personalized pacing with weather-adjusted strategy tailored to your fitness level.
Race Pass turns this into your personalised split plan, paced for this course and forecast
Live forecast, route, and elevation
Cloud Cover
100%
Wind
11.3km/h
Humidity
62%
WBGT
6.1°C
Race Day Pacing
Personalized pacing with weather-adjusted strategy tailored to your fitness level.
Race Pass turns this into your personalised split plan, paced for this course and forecast
Live forecast, route, and elevation
Race Timeline
Race starts 08:00
07:00
Starts 08:00
7°C
Feels 6°C
0.0 mm
0%
11.4 km/h
gust 14.4
08:00
Starts 08:00
7°C
Feels 7°C
0.0 mm
21%
8.1 km/h
gust 11.1
09:00
13.0 km
7°C
Feels 7°C
0.0 mm
20%
11.2 km/h
gust 14.2
10:00
26.0 km
9°C
Feels 8°C
0.0 mm
21%
11.4 km/h
gust 14.4
11:00
38.9 km
10°C
Feels 10°C
0.0 mm
21%
13.4 km/h
gust 16.4
12:00
Finished
12°C
Feels 11°C
0.0 mm
21%
12.8 km/h
gust 15.8
Conditions over time
11 Oct 2026 · Hover or drag to explore
62% humidityDew 2.1°CWBGT 6.1°C0.0 mm (21%)
9°CFeels 8°C
08:00-11:15
TempDewWBGTRain
11.3 km/h
gust 14.4 km/h
WindGust
Historical weather
Mean of race-window hours across the last 10 years, ±5 days around 11 October. Sticky years still count. This is not a forecast.
9°C
3 - 14°C range
Mostly cloudy on average
Historical: cold, mostly cloudy, with moderate winds
Historical average
10 years · ±5d around 11 October
2016-2025
Cloud Cover
62%
35 - 91% range
Wind
12km/h
3 - 27 km/h range • prevailing NNW
Humidity
63%
50 - 88% range
WBGT
8.5°C
4.5 - 9.9°C range
Race morning history
Last 10 years, around the 08:00 start hour. Typical mid-October air averages 9°C (about 0°C to 18°C in that window). The bands are that history, not a forecast range. Hover or drag to explore.
Race-morning temperature
Most mornings
5-13°C
Almost all
3-15°C
Humidity
64%
Dew
2°C
WBGT
7°C
9°CAverage
08:00-11:18
Almost all (90%)Most mornings (70%)AverageRain
Blue is most mornings. Dashed lines are the rare tails. Pink is the average. The bands are historical race mornings, not a forecast range. Blue columns are rain on the right scale. This assumes a 3:18. You can set your own time in the app.
Typical race-morning wind
Where the wind usually came from on race morning, not where it was going.
NW
Most frequent (38%)
Wind speed
0-6 km/h
6-13 km/h
13-21 km/h
21+ km/h
A start that feels cool is not a promise about the second half.
Related races
Same city, region or country, when we can resolve them. World majors also point to each other.
- FitOne Half Marathon
- Anchorage Mayor's Marathon
- Asheville Marathon
- Athens Ohio Marathon
- Austin Marathon
- Back Your Badge Marathon
- Bayshore Marathon
- Baystate Marathon
View race map for this area.
Make sense of the conditions
- Dew point, WBGT and running in the heat
Read the heat and humidity before deciding what pace makes sense.
- When drafting helps your running pace
A group can help, but its pace and the conditions still need to suit you.
- Pacing the climbs and descents
Use the course profile to think about effort, not just splits.
Pacing and conditions FAQ
Beyond conditions
Conditions are only part of the race-day loss
Pacing mistakes often add several minutes, sometimes more than conditions alone, especially when the course and conditions are not ideal.
What your plan includes
Everything you need to turn this race preview into a usable race-day plan.
Personalized pacing
Effort and pace guidance tuned to this course profile.
Weather-adjusted splits
Split targets that account for heat, wind, and elevation.
Heat adaptation & drafting
Adjust for your heat tolerance and drafting preferences.
Get your personalised race plan for City of Trees.
Pacing, splits, and race-day strategy personalised to your fitness and this course.
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