2026 Hever Castle Marathon - Sep 27 Countdown

Q: What is the Hever Castle Marathon route?

The Hever Castle Marathon runs four laps of an almost entirely off-road 10.5km loop around the historic Hever Castle estate near Edenbridge, Kent - the childhood home of Anne Boleyn. Each spectator-friendly lap winds through the formal gardens, past two lakes and into the surrounding Kentish woodland, taking in two castles and the parkland of the High Weald. Run by the Castle Race Series, it is an off-road trail marathon rather than a city road race.

Q: Is the Hever Castle Marathon flat? How hard is it?

It is not flat - the course is undulating and rated challenging. The repeated 10.5km estate loop has rolling rises through parkland and woodland, and runners consistently describe it as undulating with hills. The 2025 race report called it "brutal but beautiful". Combined with the off-road grass, gravel and trail surface, most runners finish well outside their flat road-marathon time. Plan your effort with our pace calculator and study the rolling profile with our elevation profile tool.

Q: What surface is the Hever Castle Marathon and what shoes should I wear?

The course is almost entirely off-road - a mix of mown grass, estate paths, gravel and woodland trail around the gardens and lakes, rather than tarmac. Trail shoes are the safest choice, giving grip on the grass and woodland sections, which can get slippery after late-September rain. Road shoes can cope in dry conditions, but most runners on this undulating estate loop prefer the extra traction of a trail or all-terrain shoe.

Q: What time does the Hever Castle Marathon start and what is the cut-off?

The marathon is held on the Sunday of the Hever Castle weekend - Sunday 27 September 2026 - with a morning start from the estate; confirm the exact start time on your final event instructions, as the organizer publishes wave times close to race day. The standalone marathon has a 6-hour time limit. The wider weekend also features a half marathon, 10K and a full triathlon and multisport festival.

Q: How do I enter the Hever Castle Marathon 2026, and how much is it?

Entry is open to the public online through the official Castle Race Series site (castleraceseries.com), with no ballot - but the field is capped, so popular castle races can sell out. The marathon entry fee is around 65 GBP for an individual, or 80 GBP as a relay. The race forms the marathon distance of the Hever Castle Run Series, alongside the half marathon (45 GBP) and 10K (35 GBP).

Q: Is the Hever Castle Marathon a Boston Qualifier?

No. Because it is an off-road, multi-lap estate course rather than a UK Athletics road-certified, accurately measured road race, a Hever Castle finish is not valid for Boston qualifying (BQ) or a London Good For Age (GFA) entry. The Castle Race Series itself frames it as off-road racing, distinct from an on-road city marathon. Come for the castle, the gardens and the challenge, not a PB - if a qualifying time is your goal, check the standards with our Good For Age tool and pick a fast road race instead.

Q: How do I get to Hever Castle, and where do I stay?

Hever Castle sits in rural Kent near Edenbridge, in the Sevenoaks district about an hour south of London. Hever railway station is a short walk or taxi from the estate (with onward connections via Edenbridge and Oxted), but most runners drive and use the event parking on the estate. For accommodation, Edenbridge, Sevenoaks and Tunbridge Wells offer the nearest hotels and inns; book early, as castle race weekends draw a crowd.

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Race Information

Race	2026 Hever Castle Marathon - Sep 27
City	Edenbridge
Date	2026-09-27 at 09:00
Time Limit	6 hours
Cutoff pace	8:32/km
Timezone	Europe/London
Official Site	Castle Race Series
Registration	Register · 65 GBP

Race Day Weather

Average Temperature	14.4°C / 58°F
Humidity	84%
Wind	26 km/h
Rain Chance	40%
Typical Conditions	Mild, often damp late-September morning in the Kent High Weald. Expect around 13-15C (55-59F) at the morning start, climbing into the high teens by midday, with high humidity and a real chance of showers and a breeze across the open estate parkland and lakes.

What to Prepare: Dress for mid-teens Celsius and pack a light waterproof in case of autumn showers. Trail shoes give the best grip on the grass, gravel and woodland paths, especially after rain. Run by effort, not pace - the four off-road laps and rolling parkland will sit noticeably slower than a flat road marathon.

Based on historical averages for race week. Use our Weather Score Calculator and What to Wear Guide for personalized advice.

Wind Impact on Race Day

Wind at 26 km/h can affect your marathon pace by 5-15 seconds per kilometer. Headwinds slow you down exponentially — a 20 km/h wind costs more than twice a 10 km/h wind.

Calculate your wind-adjusted pace →

Race-Week Climate

Based on 20 years of race-week weather (2005-2024), MERRA-2 reanalysis

	Cooler	Typical	Warmer
Temperature	11.8°C	14.5°C	16.9°C
Dew point	8.2°C	11.8°C	14.6°C

Wet-day chance: 40% Runnability: 69/100

Data: NASA POWER (MERRA-2 reanalysis), NASA Langley Research Center

Course Profile

Course Type	Four off-road laps of the Hever Castle estate
Elevation Gain	400m
Terrain	Trail
Profile	Genuinely undulating rather than flat. The marathon covers four laps of a 10.5km off-road loop around the formal gardens, two lakes and surrounding Kentish woodland, with rolling rises, grass, gravel and woodland-path sections each lap. Reviewers consistently rate it undulating and challenging, so plan to finish well outside a flat road time.

Prepare for 2026 Hever Castle Marathon - Sep 27

Use our free training tools to get race-ready:

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Dew Point Running Calculator — Pace Adjustment Chart

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Elevation Gain/Loss Impact Calculator

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Grade Adjusted Pace (GAP) Calculator — Hills & Strava

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Frequently Asked Questions

What is the Hever Castle Marathon route?

The Hever Castle Marathon runs four laps of an almost entirely off-road 10.5km loop around the historic Hever Castle estate near Edenbridge, Kent - the childhood home of Anne Boleyn. Each spectator-friendly lap winds through the formal gardens, past two lakes and into the surrounding Kentish woodland, taking in two castles and the parkland of the High Weald. Run by the Castle Race Series, it is an off-road trail marathon rather than a city road race.

Is the Hever Castle Marathon flat? How hard is it?

It is not flat - the course is undulating and rated challenging. The repeated 10.5km estate loop has rolling rises through parkland and woodland, and runners consistently describe it as undulating with hills. The 2025 race report called it "brutal but beautiful". Combined with the off-road grass, gravel and trail surface, most runners finish well outside their flat road-marathon time. Plan your effort with our pace calculator and study the rolling profile with our elevation profile tool.

What surface is the Hever Castle Marathon and what shoes should I wear?

The course is almost entirely off-road - a mix of mown grass, estate paths, gravel and woodland trail around the gardens and lakes, rather than tarmac. Trail shoes are the safest choice, giving grip on the grass and woodland sections, which can get slippery after late-September rain. Road shoes can cope in dry conditions, but most runners on this undulating estate loop prefer the extra traction of a trail or all-terrain shoe.

What time does the Hever Castle Marathon start and what is the cut-off?

The marathon is held on the Sunday of the Hever Castle weekend - Sunday 27 September 2026 - with a morning start from the estate; confirm the exact start time on your final event instructions, as the organizer publishes wave times close to race day. The standalone marathon has a 6-hour time limit. The wider weekend also features a half marathon, 10K and a full triathlon and multisport festival.

How do I enter the Hever Castle Marathon 2026, and how much is it?

Entry is open to the public online through the official Castle Race Series site (castleraceseries.com), with no ballot - but the field is capped, so popular castle races can sell out. The marathon entry fee is around 65 GBP for an individual, or 80 GBP as a relay. The race forms the marathon distance of the Hever Castle Run Series, alongside the half marathon (45 GBP) and 10K (35 GBP).

Is the Hever Castle Marathon a Boston Qualifier?

No. Because it is an off-road, multi-lap estate course rather than a UK Athletics road-certified, accurately measured road race, a Hever Castle finish is not valid for Boston qualifying (BQ) or a London Good For Age (GFA) entry. The Castle Race Series itself frames it as off-road racing, distinct from an on-road city marathon. Come for the castle, the gardens and the challenge, not a PB - if a qualifying time is your goal, check the standards with our Good For Age tool and pick a fast road race instead.

How do I get to Hever Castle, and where do I stay?

Hever Castle sits in rural Kent near Edenbridge, in the Sevenoaks district about an hour south of London. Hever railway station is a short walk or taxi from the estate (with onward connections via Edenbridge and Oxted), but most runners drive and use the event parking on the estate. For accommodation, Edenbridge, Sevenoaks and Tunbridge Wells offer the nearest hotels and inns; book early, as castle race weekends draw a crowd.