Mild 57°F temps at gun time mean comfortable early miles without overheating risk. Temperatures rising to 66°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing. Moderate humidity at 67% is worth noting for effort level, especially in later miles.

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Distance: 6.2mi

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Race Info

The Beat the Blerch 10K is an out-and-back run on the gravel Snoqualmie Valley Trail, starting and finishing at Tolt-MacDonald Park in Carnation, Washington. The trail is flat and winds through evergreen, mossy forest east of Seattle. Runners pass the same aid station twice, where Nutella sandwiches and birthday cake are on offer alongside the usual drink and gels.

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Race weekend

Saturday, September 12

8:00 AMMarathon (26.2 mi)

9:00 AMHalf Marathon (13.1 mi)

9:30 AM10K (6.2 mi)

12:00 PM5K (3.1 mi)

FAQ

When is the 2026 Beat the Blerch 10K?

The 2026 Beat the Blerch 10K will be held on Saturday September 12, 2026.

What is the time limit for the Beat the Blerch 10K?

The time limit for the Beat the Blerch 10K is 5.5 hours.

What will the weather be like for the 2026 Beat the Blerch 10K?

The forecast calls for a high of 66°F and a low of 54°F with a 0% chance of rain. Check our detailed hourly forecast above for the best 10K race plan.

Historical Weather

Based on 10 years of data

Avg Temp

62°F

L:61° H:63°

RunScore

Conditions

Rain Freq

10%

1 of 10 yrs

Wind5mph

Dew53°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Beat the Blerch 10K Partly cloudy throughout the day. 2026	57°/60°	-	50°
2025 Beat the Blerch 10K Partly cloudy throughout the day with afternoon rain. 2025	61°/63°	-	58°
2024 Beat the Blerch 10K Clear conditions throughout the day. 2024	68°/70°	-	61°
2023 Beat the Blerch 10K Clear conditions throughout the day. 2023	60°/63°	-	51°
2022 Beat the Blerch 10K Clear conditions throughout the day. 2022	66°/70°	-	47°
2018 Beat the Blerch 10K Partly cloudy throughout the day with late afternoon rain. 2018	56°/58°	-	49°
2017 Beat the Blerch 10K Partly cloudy throughout the day. 2017	56°/60°	-	44°
2016 Beat the Blerch 10K Cloudy skies throughout the day with rain. 2016	58°/60°	Light	57°
2015 Beat the Blerch 10K Clear conditions throughout the day. 2015	65°/67°	-	58°
2014 Beat the Blerch 10K Clearing in the afternoon. 2014	60°/61°	-	56°