Weather
Climate Avg| Time | Temp | Dew Pt | Humidity | Wind | Conditions |
|---|---|---|---|---|---|
| Start | 46.2 – 46.5°F | 36° Crisp | 51 – 85% | 4 mph S | Clear sky |
| 8:00 AM | 50.1 – 50.9°F | 34° Crisp | 38 – 75% | 5 mph S | Clear sky |
| 9:00 AM | 54.2 – 67.9°F | 32° Crisp | 26 – 55% | 4 mph SE | Clear sky |
| 10:00 AM | 57 – 70.3°F | 33° Crisp | 25 – 48% | 4 mph W | Clear sky |
| 11:00 AM | 60.4 – 73.7°F | 32° Crisp | 21 – 42% | 4 mph N | Clear sky |
| Finish | 64.2 – 75.9°F | 31° Crisp | 20 – 35% | 5 mph NE | Clear sky |
Based on 3-year average for this date. Real forecast available in 288 days.
Elevation Profile
Course Stats
Mile Splits
| Mile | Grade |
|---|---|
| 1 | +0.1% |
| 2 | +0.6% |
| 3 | -1.0% |
| 4 | -1.1% |
| 5 | -0.1% |
| 6 | +0.2% |
| 7 | +1.4% |
| 8 | +1.0% |
| 9 | -0.2% |
| 10 | +0.0% |
| 11 | +0.3% |
| 12 | +0.8% |
| 13 | +0.8% |
| 14 | -0.0% |
| 15 | +1.7% |
| 16 | +0.2% |
| 17 | -1.3% |
| 18 | -1.3% |
| 19 | -0.8% |
| 20 | -1.2% |
| 21 | -1.3% |
| 22 | -0.3% |
| 23 | +0.4% |
| 24 | +0.7% |
| 25 | +0.8% |
| 26 | -0.5% |
| 27 | -0.8% |
RM Difficulty Index
Race-Day Weather History
Race-morning conditions on this date over the past 10 years: median 56°F with a 41°F dew point and 5 mph wind. Heat has rarely been a factor.
| Year | Temp | Dew Pt | Wind | Rain | Sky |
|---|---|---|---|---|---|
| 2025 | 52°F | 26°F | 3 mph | — | Clear |
| 2024 | 53°F | 42°F | 5 mph | — | Clear |
| 2023 | 58°F | 43°F | 5 mph | — | Clear |
| 2022 | 59°F | 38°F | 4 mph | — | Partly cloudy |
| 2021 | 53°F | 49°F | 10 mph | — | Drizzle |
| 2020 | 54°F | 39°F | 3 mph | — | Partly cloudy |
| 2019 | 63°F | 36°F | 8 mph | — | Partly cloudy |
| 2018 | 58°F | 42°F | 4 mph | — | Clear |
| 2017 | 59°F | 34°F | 9 mph | — | Clear |
| 2016 | 47°F | 45°F | 4 mph | — | Drizzle |
Morning conditions (race window) on the Denver Marathon calendar date each year, from the ERA5 reanalysis archive — the race’s usual slot, not necessarily each edition’s exact day.
Denver Marathon Pace Calculator & Race Plan
Denver runs at 5,280 feet of elevation, which adds a measurable cost to your pace. If you're coming from sea level, expect a 2-4% performance hit from altitude alone, on top of whatever the course and weather throw at you.
The course has 217 meters of gain with rolling hills throughout. Our model includes altitude adjustment based on the start elevation, so your splits reflect what a mile at altitude actually feels like.
Denver Marathon FAQ
When is the next Denver Marathon?›
The next Denver Marathon is on Sunday, May 16, 2027.
How long is the Denver Marathon?›
The Denver Marathon is 26.2 miles (42.195 km), the standard marathon distance. It runs in Denver, CO.
How much elevation gain does the Denver Marathon have?›
The Denver Marathon has about 710 ft (217 m) of climbing and 727 ft of descent, with a maximum grade of 1.7%.
Is the Denver Marathon flat, downhill, or hilly?›
The Denver Marathon starts and finishes at roughly the same elevation (net -5 m). With 710 ft of total climbing along the way, the profile rolls even though the net change is small.
How hard is the Denver Marathon?›
Runner's Math scores the Denver Marathon 44/100 (Challenging) — #8 of 38 marathon courses in our library, ranked by modeled time cost. The profile costs about 1:38 versus a flat course for a runner at 4:00-marathon pace.
What's the weather usually like at the Denver Marathon?›
Over the past 10 years on this date, median race-morning conditions were 56°F with a 41°F dew point and 5 mph wind. Heat has rarely been a factor.