Denver Colfax Half Marathon

Denver, CO|Sunday, May 17, 2026|32 days away
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Weather

Climate Avg
TimeTempDew PtHumidityWindConditions
Start48.4 – 50.3°F38° Crisp55 – 70%7 mph SWClear sky
8:00 AM53 – 55.6°F39° Crisp50 – 63%6 mph SWClear sky
Finish56.4 – 56.4°F35° Crisp45 – 45%0 mph EPartly cloudy

Based on 3-year average for this date. Real forecast available in 16 days.

Elevation Profile

Loading map…

Course Stats

Net Elevation
+0 ft
Distance
13.11 mi
Total Gain
+473 ft
Total Loss
-473 ft
Max Grade
14.0%
Altitude (+0.2%)
5,262 ft

Mile Splits

MileGrade
1+1.2%
2-0.1%
3-0.9%
4+0.8%
5-0.3%
6-1.1%
7-0.2%
8+0.2%
9+0.1%
10+0.5%
11-0.4%

Denver Colfax Half Marathon Pace Calculator & Race Plan

The Denver Colfax Half starts and finishes at City Park, passing through downtown, the State Capitol, and the Denver Zoo. About 350 feet of gain at 5,280 feet of altitude. The thin air makes this course run harder than the modest elevation profile suggests.

May in Denver is usually great for running. Our model accounts for the altitude effect on pace and the gentle terrain.