Attraction · Hillingdon · London

Harmondsworth Great Barn

Hillingdon counts Harmondsworth Great Barn, an attraction, among its places to visit. Another 4 places to visit lie within 5 km. The first to add nearby is Windsor Castle, at 8.7 km.

Where

In Hillingdon

inside the built-up area

Warmest months

May–Sep

highs of 18–23°C

In brief

Attraction in Hillingdon

Inside Hillingdon

Harmondsworth Great Barn is inside Hillingdon’s built-up area, with 4 more places to visit within 5 km. Towns near it ↓

Written from OpenStreetMap, Wikidata, the ONS built-up areas and Met Office 1991–2020 averages.

When to go

Weather by the month

Afternoons in Hillingdon reach 18–23°C from May to September.

Jan8° / 2°63 mm

Feb9° / 2°48 mm

Mar12° / 4°42 mm

Apr15° / 5°46 mm

May18° / 8°48 mm

Jun21° / 11°50 mm

Jul23° / 13°46 mm

Aug23° / 13°57 mm

Sep20° / 11°52 mm

Oct16° / 8°70 mm

Nov11° / 5°72 mm

Dec9° / 3°63 mm

Green months are the warmest. Typical afternoon highs and night lows in Hillingdon, and rain in a month. Met Office HadUK-Grid 1991–2020 averages for Hillingdon. Opening times change through the year: check before you go. Hillingdon’s full climate →

About

Harmondsworth Great Barn

Attraction.

In Hillingdon, inside the town’s built-up area.

Type: Attraction
Town: in Hillingdon
Official site: english-heritage.org.uk/visit/places/harmondsworth-barn

Facts: Wikidata (CC0) and OpenStreetMap (© OpenStreetMap contributors).

The map

The area around Harmondsworth Great Barn

The map centres on Harmondsworth Great Barn, in orange, with nearby places numbered.

Towns near it

Towns that count Harmondsworth Great Barn

By population, Hillingdon leads the 8 with 307,089. Its home town tops the list; the rest follow by distance.

1 · It’s in town

Hillingdon

307,089 people · 31 places to visit

2 · 1.8 km southwest of it

Poyle

1,736 people · 11 places to visit

3 · 1.9 km northwest of it

Richings Park

1,787 people · 5 places to visit

4 · 2.4 km northwest of it

Iver

3,267 people · 4 places to visit

Compare the 8 towns

Town	Where Harmondsworth Great Barn is	People	Places to visit
Hillingdon	It’s in town	307,089	31
Poyle	1.8 km southwest of it	1,736	11
Richings Park	1.9 km northwest of it	1,787	5
Iver	2.4 km northwest of it	3,267	4
Colnbrook	2.6 km west of it	1,898	12
Stanwell Moor	2.8 km southwest of it	1,431	12
Stanwell	3.2 km south of it	11,728	12
Slough	3.2 km west of it	166,868	36

Make a day of it

While you are near Harmondsworth Great Barn

Among the 121 within 15 km are 3 historic houses, 2 gardens and 2 theme parks.

CastleWindsor Castle8.7 km away 2

Historic house · Historic Royal PalacesHampton Court Palace14 km away 3

GardenKew Gardens13 km away 4

Garden · National TrustRunnymede7.7 km away 5

Historic house · National TrustOsterley House8.9 km away · 350K visitors a year 6Theme parkBig drawTheme parkThorpe Park9.8 km away · 1.6M visitors a year (2024)7

Historic houseFrogmore House8.1 km away 8

Big drawTheme parkLegoland Windsor12 km away · 2.3M visitors a year (2024)

Within 15 km, close and well known first. Numbers match the map.

Asked about Harmondsworth Great Barn

Where is Harmondsworth Great Barn?

Harmondsworth Great Barn is in Hillingdon, London, inside the town’s built-up area.

What is Harmondsworth Great Barn?

Attraction.

When is the best time to visit Harmondsworth Great Barn?

May to September are the warmest months in Hillingdon, with afternoon highs of 18–23°C (Met Office 1991–2020 averages).

What else is there to see near Harmondsworth Great Barn?

Within 15 km: Windsor Castle (8.7 km), Hampton Court Palace (14 km), Kew Gardens (13 km) and Runnymede (7.7 km).

Places: OpenStreetMap (© OpenStreetMap contributors, Open Database Licence) and Wikidata (CC0), placed in the ONS 2022 built-up area (Open Government Licence v3.0). Visitor counts are the latest Wikidata gives, with their year.

Photos: each place’s Wikidata image, from Wikimedia Commons under the licence below (our copy, resized).

Photo credits (7)

Windsor Castle: Diliff, CC BY 2.5, Wikimedia Commons
Hampton Court Palace: Ricardalovesmonuments, CC BY-SA 4.0, Wikimedia Commons
Kew Gardens: Diliff, CC BY-SA 3.0, Wikimedia Commons
Runnymede: Wyrdlight, CC BY 3.0, Wikimedia Commons
Osterley House: Osterley Park House, London-25June2009.jpg: Jim Linwood derivative work: Snowmanradio, CC BY 2.0, Wikimedia Commons
Frogmore House: Gill Hicks, CC BY-SA 2.0, Wikimedia Commons
Legoland Windsor: Rob Young profile, CC BY 2.0, Wikimedia Commons

Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.