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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • 10K
  • 10 km
  • Portland
  • Event weekend starts
  • Open entry

Portland Coastal Marathon 10K

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2027 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

Modelled energy-cost change 4.8% versus flat · net elevation -0 m

View verified GPS mapOfficial event website & entry ↗
Plan my trainingPlan my paceData current as of

Decision summary

Portland Coastal Marathon 10K at a glance

Route ascent
207 m

Lower than 15% of comparable mapped races

Typical conditions
78/100

Historical race-date favourability, not a forecast

Evidence depth
25 verified facts

Stored GPS route

Quick answers

What runners ask first

Portland Coastal Marathon 10K route map

raceindex.org has a GPS course file for Portland Coastal Marathon 10K, so runners can inspect the route line on the map. Elevation charts and ascent figures appear only when that file includes usable elevation data.

How hilly is the Portland Coastal Marathon 10K?

The Portland Coastal Marathon 10K route has 207 m of ascent, 208 m of descent and an estimated 4.8% grade-adjusted pace penalty versus a flat route.

Where does the Portland Coastal Marathon 10K route go?

The Portland Coastal Marathon 10K route starts at Weymouth and Portland National Sailing Academy, Portland, DT5 1SA and finishes at Weymouth and Portland National Sailing Academy, Portland, DT5 1SA. Underfoot, expect coastal trail on the South West Coast Path (exposed limestone peninsula terrain). It passes Isle of Portland, South West Coast Path and Weymouth and Portland National Sailing Academy. Self-navigation event: runners download the route in advance and follow the coast path with no course markers (keep the sea on your left for loop 1 and the opposite for loop 2).

What should runners know on race day for the Portland Coastal Marathon 10K?

Traditional earbuds and noise-cancelling headphones are not permitted for safety on the coastal path.

Race character

Scenery

  • Island
  • Coastal
  • Waterfront
  • City
  • Historic

Atmosphere

  • Scenic Tour
  • Wilderness

Terrain

  • Trail

Entry, logistics and records

Records and field

Field size
Entries are capped at 500 across the event. When it's full, it's full.

Entry requirements

Entry status
Open entry: The held registration model is open entry and this edition is not marked sold out.

Race day logistics

Medal
Bespoke Portland Coastal finisher medal.
Finisher tee
Optional Portland Coastal technical running T-shirt available to purchase at registration.
On-course music
Traditional earbuds and noise-cancelling headphones are not permitted for safety on the coastal path.

Access and course status

Start
Weymouth and Portland National Sailing Academy, Portland, DT5 1SA
Finish
Weymouth and Portland National Sailing Academy, Portland, DT5 1SA
Measured course
No

Course facts

Course type
Laps
Surface
Coastal trail on the South West Coast Path (exposed limestone peninsula terrain).
Landmarks
Isle of Portland, South West Coast Path, Weymouth and Portland National Sailing Academy
Notable features
  • Self-navigation event: runners download the route in advance and follow the coast path with no course markers (keep the sea on your left for loop 1 and the opposite for loop 2). Checkpoint verification confirms the full distance is completed
  • Mandatory kit required, including minimum 500ml fluid capacity, windproof jacket, emergency nutrition, head covering, charged waterproofed mobile phone, foil blanket or bin liner, whistle and a small first aid kit
  • 10k is a single loop section of the island

How hilly is the Portland Coastal Marathon 10K?

12%18%40%20%11%
  • Steep descent 12%
  • Descent 18%
  • Flat 40%
  • Climb 20%
  • Steep climb 11%
Total ascent
207 m
Net elevation
−0 m
GAP factor
4.8%
Longest climb
840 m at 10.1%
Gradient mix and ascent are derived from the course geometry under our published normalisation, not taken from organiser marketing.

What are typical race-day conditions?

  • 5°CTypical temperature
  • 17 kphTypical wind
  • 5 mmTypical rainfall
  • 78Favourability /100
Typical conditions for the race date and locality, cooler than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

More race details

Is the Portland Coastal Marathon 10K flat?

Its normalised GAP factor is 4.8% slower than a flat course, with about 207 m of total ascent.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (3)

Read the full methodology →