All-Out Fallfest Half Marathon

Westminster, CO, USA · September 18, 2027·
partly-cloudy-day55°·68° high·Light·Dry
8
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All-Out Fallfest Half Marathon race day weather

partly-cloudy-day
55°at start
77° high
Light
Dry
Your goal
0:00:00

Mild start, warming trend ahead

Runners will face temperatures rising from 55°F at the start to 68°F by finish. With light winds at 6 mph from the south, conditions will be relatively calm, allowing for a steady pace. However, as the temperature increases, it’s advisable to start conservatively and ensure proper hydration, especially during the warmer latter miles. The tailwinds at mile 5 and mile 10 could provide a boost, making those segments advantageous.

Race day forecast available in 294 days
clear-night10
clear-day10
partly-cloudy-day10
partly-cloudy-day8
partly-cloudy-day7
partly-cloudy-day6
partly-cloudy-day5
clear-day5
partly-cloudy-day5

Pace Calculator

13.1mi
0:00:00
HH:MM:SS
Pace
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Common Goals:

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All-Out Fallfest Half Marathon route and elevation

The All-Out Fallfest Half Marathon course has about 488 ft (149 m) of climbing and 488 ft (149 m) of descent, and finishes near the elevation it starts. It is hillier than 89% of the half marathon courses racecast.io has mapped, measured by what the hills cost in time. The hardest mile is mile 4, with 93 ft (28 m) of climbing and a 1.2% average grade.

Biggest climbs

  • Miles 0.3 to 2.7: climbs about 120 ft (36 m).
  • Miles 2.9 to 3.7: climbs about 110 ft (34 m).
  • Miles 5.4 to 7.7: climbs about 145 ft (44 m).

What the hills cost

  • 1:45 on a flat course is about 1:46 here (1 minute slower).
  • 2:00 on a flat course is about 2:02 here (2 minutes slower).
  • 2:15 on a flat course is about 2:17 here (2 minutes slower).

Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.

Even-effort splits for a 1:45, 2:00 or 2:15 finish
The All-Out Fallfest Half Marathon mile splits at even effort for three finish times, with each mile's climb and descent
MileClimbDescent1:452:002:15
148 ft21 ft8:079:1710:26
243 ft10 ft8:119:2110:32
374 ft39 ft8:129:2210:32
493 ft31 ft8:259:3710:49
556 ft34 ft8:059:1510:24
641 ft32 ft7:599:0710:16
765 ft17 ft8:189:2910:40
861 ft7 ft8:219:3310:44
98 ft76 ft7:398:449:51
1010 ft132 ft7:298:339:36
1136 ft72 ft7:468:529:59
1213 ft44 ft7:478:5410:01
1314 ft55 ft7:448:519:57
Last 0.17 ft0 ft0:571:051:13

Explore the All-Out Fallfest Half Marathon course with the weather and your pace along the route, or compare it with other races.

Race Plan

Get your personalized All-Out Fallfest Half Marathon race plan

A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.

Race Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

About the All-Out Fallfest Half Marathon

The All-Out Fall Fest Half Marathon in Westminster, Colorado, offers runners a scenic journey along the Big Dry Creek Trail, leading to the picturesque Standley Lake Regional Park. Participants enjoy a mix of paved and gravel paths, with breathtaking views of the Flatirons and a notable stretch near the dam. The event embraces 80s nostalgia, adding a fun and energetic vibe to the race experience.

Race weekend

Saturday, September 18
8:00 AMHalf Marathon (13.1 mi)
8:30 AM10K (6.2 mi)
8:40 AM5K (3.1 mi)

All-Out Fallfest Half Marathon FAQ

When is the 2027 All-Out Fallfest Half Marathon?

The 2027 All-Out Fallfest Half Marathon will be held on Saturday September 18, 2027.

What is the time limit for the All-Out Fallfest Half Marathon?

The time limit for the All-Out Fallfest Half Marathon is 4 hours.

What will the weather be like for the 2027 All-Out Fallfest Half Marathon?

The forecast calls for a high of 80°F and a low of 51°F with a 2% chance of rain.

What is the elevation gain of the All-Out Fallfest Half Marathon?

The All-Out Fallfest Half Marathon course has about 488 ft (149 m) of climbing and 488 ft (149 m) of descent, and finishes near the elevation it starts. It is hillier than 89% of the half marathon courses racecast.io has mapped, measured by what the hills cost in time.

Is the All-Out Fallfest Half Marathon hilly?

Moderately. It has about 37 ft (11 m) of climbing per mile. The hardest mile is mile 4, with 93 ft (28 m) of climbing and a 1.2% average grade. 2:00 on a flat course is about 2:02 here (2 minutes slower).

What is the weather usually like for the All-Out Fallfest Half Marathon?

Over the 12 years racecast.io has race-day weather for (2015 to 2026), it averaged 54°F at the start and 66°F by a typical finish. It has not rained during race hours in any of those years.

What was the hottest All-Out Fallfest Half Marathon?

Of the 12 years on record, 2020 was the warmest, reaching 74°F during race hours. The coldest start was 2016, at 45°F.

What was the windiest All-Out Fallfest Half Marathon?

Of the 12 years on record, 2020 was the windiest, with wind averaging 6 mph during race hours. The calmest was 2023, at 2 mph.

All-Out Fallfest Half Marathon weather history

Based on 12 years of data
Avg Temp
60°F
L:54° H:66°
RunScore
8
Conditions
Rain Freq
0%
0 of 12 yrs
Wind3mph
Dew41°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
partly-cloudy-day
59°/71°-
6
2025
partly-cloudy-day
56°/69°-
7
2024
clear-day
59°/73°-
7
2023
clear-day
50°/61°-
9
2022
clear-day
56°/68°-
7
2021
clear-day
53°/69°-
8
2020
partly-cloudy-day
60°/74°-
7
2019
clear-day
58°/68°-
8
2018
clear-day
54°/70°-
8
2017
cloudy
48°/50°-
10
2016
partly-cloudy-day
45°/57°-
10
2015
clear-day
53°/65°-
8