How far is the CTS Suffolk?

The CTS Suffolk offers 4 distances: 10K (6.1 miles), Half Marathon (21.7 km / 13.5 miles), Marathon (43.0 km / 26.7 miles), Ultra (52.6 km / 32.7 miles).

How much climbing is in the CTS Suffolk?

The 10K has 85 m of ascent. The Half Marathon has 160 m of ascent. The Marathon has 288 m of ascent. The Ultra has 344 m of ascent.

Dunwich, Suffolk

Endurancelife CTS Suffolk

Sat, 10 Oct 2026

Forest, heath and beach out of Dunwich.

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What runners wore

Nobody has told us what they wore on the CTS Suffolk yet. It is the thing most runners want to know before they enter, and no organiser publishes it.

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Pick your distance

9.8

km · 6.1 mi

m ascent

Start time not confirmed yet — check with the organiser.

Terrain and trail

forestbeachgrass

Reviews

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How to enter

Sat, 10 Oct 2026 · Entries open

No entry link yet. Check Endurancelife’s site ↗

Common questions

: The CTS Suffolk offers 4 distances: 10K (6.1 miles), Half Marathon (21.7 km / 13.5 miles), Marathon (43.0 km / 26.7 miles), Ultra (52.6 km / 32.7 miles).
: The 10K has 85 m of ascent. The Half Marathon has 160 m of ascent. The Marathon has 288 m of ascent. The Ultra has 344 m of ascent.
: Not graded yet. A TRP grade is worked out from distance and climb measured off the course file, and there isn't one for the CTS Suffolk yet.
: We haven't confirmed the marking on the CTS Suffolk with Endurancelife. Check their race information before you enter rather than assuming it either way.
: We don't hold a compulsory kit list for the CTS Suffolk. Endurancelife confirm mandatory kit in their race information, usually in the final instructions.
: We don't hold published time limits for the CTS Suffolk. If Endurancelife set cut-offs, they'll be in the race information.
: We don't hold a checkpoint list for the CTS Suffolk. What's on the table varies a lot between races, so check the Endurancelife race information rather than turning up expecting food.
: Not yet — we don't hold a course file for the CTS Suffolk. Some organisers only send the GPX to entrants. If we get one, it goes up free, with no sign-up.
: Sat, 10 Oct 2026. Entries open.