RacesReviewed / Race Intelligence

Susitna Little Su 50K

50K

The Susitna Little Su 50K is a challenging mid-February winter ultra through the frozen wilderness of Big Lake, Alaska. Perfect for runners ready to test their limits on ice and snow, this event shares the same breathtaking Alaskan terrain as its legendary big brother—the Susitna 100—in a more accessible format. Expect sub-zero temperatures, frozen lake crossings, and the camaraderie of dedicated winter ultra runners conquering the frozen wild together.

RegisterOpen signupultrasignup.com WebsiteOfficial race sitesusitna100.com LocationBig Lake, AKRace start area

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Runner Perspective

What runners say

Recent runner quotes and ratings from this race.

Runner score4.3 / 5

Reviews3 reviews

"The Susitna Little Su 50K is a mid-February winter ultra through the frozen wilderness of Big Lake, Alaska. It shares the same terrain as the full Susitna 100 — frozen lakes,..."

Gateway to winter ultras — the Susitna 100 crew's 50K gem50K · advanced · Apr 2026

"I have been running road marathons for years but never tried anything in winter until Susitna Little Su. The course uses frozen lakes, rivers, and snow-packed trails near Big..."

Winter ultra baptism — 50K on frozen Alaska50K · intermediate · Apr 2026

Current review averageLive runner ratings

4.3 / 5 · OverallAverage rating from saved runner reviews for the full race experience.

Course format

City 50k layout

Course geometry is still filling in, but the race format, location, and planning signals already make the day easier to read.

Elevation profile

Course profile still taking shape

50K runners can still use the weather, logistics, and race format to plan even while exact elevation detail catches up.

Pressure point

Race-morning execution

This looks more like a race where calm logistics and disciplined pacing matter more than one famous course feature.

Weather bias

Weather usually manageable

Typical starts are around 12F with 2 mph winds.

Free training plan

Build a free 50K plan for this race.

Keep race research first. When you want it, open a quick planner that uses the selected distance, the selected race date, and the course itself.

This distance needs a confirmed race date before we can build a date-aware plan.

Course Profile

Susitna Little Su 50K course overview

Summary course view

This course section is built from a lighter course overview so you can understand how the race is likely to run.

Synced course focus

Mid-course

Mile 1.0 · 0 ft · Course intelligence will improve as GPX and logistics data land.

Course trace

This course view focuses on the best route information currently available.

Pressure model

Pressure points highlight where pacing or effort may change during the race.

What comes next

Use the course, weather, logistics, and reviews together to build your race-day plan.

Difficulty Meter

50K race demand

Planning read

71/100

Course detail: Moderate
Weather detail: Historical + forecast
Race-day detail: Moderate
Weather view: Live forecast

Weather read

Light tailwind assist

Route-aligned wind gives you a quick feel for how the day may race before you dig into the full weather section.

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Weather Analysis

Susitna Little Su 50K weather outlook

Forecast + history

Weather blends the live forecast with the race's historical weather patterns to help you plan.

Route-aligned wind

+3.5 mph

Interpretation

Light tailwind assist

NOAA race-window forecast is live. Wind is scored relative to the course bearing where possible.

Course bearing 0.0 degAverage wind 5.0 mphDominant direction SW

Estimated weather effect

+0.42%

Heuristic read

Close to neutral weather

Help score

-8

Historical profile

Historically close to neutral

Based on 7 years of race-weekend weather in the archive.

Avg start temp 12.3FAvg wind 1.6 mphAligned wind N/A

Tailwind years

0%

Headwind years

0%

Helpful weather

0%

Forecasts use current race-area weather, and history looks at past race-weekend conditions to show what runners have typically faced.

Weather history

2025 race-weekend conditions

Race date

Feb 15, 2025

Avg temperature

22.3F

Avg wind

2.3 mph

Aligned wind

N/A

Historical weather pending

+0.35% estimated finish-time effect · 9 hourly observations

Race zone

55F

Scattered Rain Showers

5.0 mph · SW

City center

55F

Scattered Rain Showers

5.0 mph · SW

Finish area

55F

Scattered Rain Showers

5.0 mph · SW

Course Breakdown

Where the race starts costing more

Course rhythm

Active segment

Middle rhythm

This segment is a layout-safe placeholder until richer course data arrives.

Avg grade n/aFocused mile 1.0Pacing watchpoint

Race-Day Logistics

Susitna Little Su 50K race-day logistics

Planning basics

Race weekend

7 recorded years

The basic race structure is in place for planning.

Distance options

1 distance

This page can show the event correctly even when some race-day detail is still light.

Race-day planning

More details coming

Packet pickup, parking, support flow, and reunion details may still be limited.

Course Map

Route shape, city context, and key course moments in one view.

Map + course context

Map overview

This map gives you a race-area view and course orientation even when the full route is not available.

Highlighted point

Mid-course

Course intelligence will improve as GPX and logistics data land.

Mile 1.00 ftOpening settle

What to watch

Use this map to get your bearings before race day and understand the general shape of the course area.

Course coverage

Detailed route geometry and extra overlays may still be limited for this race.

Why it matters

Big Lake, AK should still be easy to plan around, even when some course details are lighter than others.

Planning

Use the 50K at Susitna Little Su 50K as a planning target rather than a qualification race.

Open entry

Entry posture

Open entry

There is no qualification signal in the current event record.

Race framing

50K planning

The page emphasizes course, logistics, and weather rather than qualification standards.

Susitna Little Su 50K official site Registration

Race History

Race history overview

Some history available

Past editions tracked

7

Recorded race years

Available

50K

Current

Benchmarks

Growing archive

More historical context will be added here as the archive grows

In progress

Review Radar

Runner signal for Susitna Little Su 50K

Runner reviews live

Course

87/100

Logistics

47/100

Crowd support

40/100

Aid stations

93/100

Finish area

73/100

Recommend

87/100

Your draft saves locally as you answer.

Common questions

FAQ

Question 1What is the Susitna Little Su 50K?

Question 2Is the Susitna Little Su 50K a Boston qualifier?

Question 3What makes the Susitna Little Su 50K special?