First pick
Forêt domaniale de Montmorency
Wood or forest · 400 m outside the commune
373 ha24.5 km of path
5 h 25 minto walk all 24.5 km of path
3.1 km north-westfrom the center
Directionsto a point inside
Photo: Pymouss · CC BY-SA 4.015%woodland
Outdoors in Groslay · protected areas, woods and footpaths
Groslay has more footpaths per km² than 8 in 10 French towns
13 km of footpaths cross Groslay (4.3 km per km²). Groslay has 6 km of waymarked hiking routes. No protected area reaches Groslay; the nearest, Sites de Seine-Saint-Denis (Natura 2000), is 4.7 km from the town center. France has no Outdoors Grade yet: these are the figures, each beside the compared towns’ median.
Protected areas
0%
of the commune’s land
Nearest: Sites de Seine-Saint-Denis, 4.7 km
Woodland
15%
of the land, mapped on OpenStreetMap
Compared town: 13%
Footpaths
13 km
4.3 km per km²
Compared town: 1.7 km per km²
Hiking routes
6 km
waymarked, GR and others
Compared town: 0.3 km per km²
Parks & woods
7
named, in or within 400 m of the commune
First: Forêt domaniale de Montmorency
Throughout this page, the Val-d'Oise median and the France median are the median of compared communes (those with an overall grade), each figure its own median.
What kind of place
What kind of outdoors place is Groslay?
Read from the data: what stands out first, good and less good.
A place of footpaths4.3 km per km² of mapped footpath, against 1.7 km per km² for the median compared town.On waymarked routes6 km of GR and other hiking routes cross the commune.Protected land nearbySites de Seine-Saint-Denis (Natura 2000) is 4.7 km from the town center.
What sets Groslay apart: its footpaths, then its hiking routes.
Against French towns
How Groslay compares with French towns
Each figure against the 3,798 compared French towns (communes with an overall grade): the marked bar is the town’s, the line the median. Described, not graded.
Protected areas0%Share of the land in a national park, regional nature park, nature reserve or Natura 2000 site
22out of 100
Woodland15%Share of the land mapped as forest or woods on OpenStreetMap
53out of 100
Footpaths4.3 km per km²Km of mapped footpath and track open on foot, per km² of the commune
87out of 100
Hiking routes1.9 km per km²Km of waymarked hiking routes (GR and others), per km² of the commune
96out of 100
Percentiles among compared French towns; ties count half.
Towns its size
Groslay has the 4th most footpaths per km² of 41 towns its size
The 40 compared French towns nearest in population (8,359 to 8,555 residents), by km of footpath per km². Hover for each one’s protected land and woods; click for its page.
From La Grande-Motte (6 km per km²) to Gennes-Val-de-Loire (0.3 km per km²).
Every town in the comparison
| Town | Paths (km/km²) | Woodland | Protected | Coast | |
|---|---|---|---|---|---|
| 1 | La Grande-Motte Hérault | 6 | 4% | 53% | On it |
| 2 | Le Plessis-Bouchard Val-d'Oise | 5.8 | 1.2% | 0% | 132 km |
| 3 | Larmor-Plage Morbihan | 5.3 | 17% | 0% | On it |
| 4 | Groslay Val-d'Oise | 4.3 | 15% | 0% | 138 km |
| 5 | La Salvetat-Saint-Gilles Haute-Garonne | 4.3 | 12% | 0% | 158 km |
| 6 | Rouvroy Pas-de-Calais | 3.3 | 5% | 0% | 81 km |
| 7 | Pignan Hérault | 3.2 | 1.7% | 34% | 13 km |
| 8 | Venelles Bouches-du-Rhône | 3 | 41% | 10% | 29 km |
| 9 | Vendin-le-Vieil Pas-de-Calais | 2.7 | 11% | 0% | 72 km |
| 10 | Pérenchies Nord | 2.5 | 0.9% | 0% | 56 km |
| 11 | Trégueux Côtes-d'Armor | 2.4 | 5.5% | 0% | 4.1 km |
| 12 | Varces-Allières-et-Risset Isère | 2.4 | 33% | 32% | 194 km |
| 13 | Sautron Loire-Atlantique | 2.3 | 16% | 0% | 34 km |
| 14 | Ballan-Miré Indre-et-Loire | 2.2 | 30% | 0% | 176 km |
| 15 | Privas Ardèche | 2.1 | 32% | 1.6% | 136 km |
| 16 | Bormes-les-Mimosas Var | 2.1 | 38% | 8.3% | On it |
| 17 | Orchies Nord | 1.9 | 1.7% | 0.7% | 84 km |
| 18 | Bassens Gironde | 1.9 | 0.3% | 10% | 13 km |
| 19 | Pont-l'Abbé Finistère | 1.9 | 13% | 2% | On it |
| 20 | Vif Isère | 1.8 | 48% | 7% | 189 km |
| 21 | Noyal-Châtillon-sur-Seiche Ille-et-Vilaine | 1.8 | 4.5% | 0% | 56 km |
| 22 | Hirson Aisne | 1.8 | 66% | 66% | 167 km |
| 23 | Saint-Claude Jura | 1.7 | 78% | 100% | 318 km |
| 24 | Lillebonne Seine-Maritime | 1.6 | 18% | 0% | 16 km |
| 25 | Uzès Gard | 1.6 | 6.9% | 0% | 57 km |
| 26 | Trignac Loire-Atlantique | 1.5 | 0.1% | 65% | 1.7 km |
| 27 | Unieux Loire | 1.5 | 23% | 16% | 205 km |
| 28 | Saint-Aubin-lès-Elbeuf Seine-Maritime | 1.4 | 4.8% | 0.5% | 50 km |
| 29 | Peymeinade Alpes-Maritimes | 1.4 | 31% | 20% | 13 km |
| 30 | Reignier-Ésery Haute-Savoie | 1.1 | 26% | 3.1% | 279 km |
| 31 | Éguilles Bouches-du-Rhône | 1 | 12% | 54% | 23 km |
| 32 | Theix-Noyalo Morbihan | 0.9 | 11% | 98% | On it |
| 33 | Feurs Loire | 0.8 | 6.8% | 37% | 243 km |
| 34 | Marseillan Hérault | 0.7 | 0.9% | 52% | On it |
| 35 | Talmont-Saint-Hilaire Vendée | 0.6 | 6.9% | 8.5% | On it |
| 36 | Châteauneuf-sur-Loire Loiret | 0.6 | 49% | 22% | 222 km |
| 37 | Le Loroux-Bottereau Loire-Atlantique | 0.6 | 6.4% | 8.8% | 53 km |
| 38 | Saint-Vallier Saône-et-Loire | 0.6 | 19% | 0% | 344 km |
| 39 | Thaon-les-Vosges Vosges | 0.6 | 41% | 0% | 406 km |
| 40 | Onnaing Nord | 0.5 | 16% | 1.1% | 105 km |
| 41 | Gennes-Val-de-Loire Maine-et-Loire | 0.3 | 29% | 100% | 134 km |
The map
Parks, woods, footpaths & countryside
Tap a number to zoom to a park or wood. Tap a layer to hide it. The dashed line is the commune’s boundary.
Green: parks, gardens and woods mapped on OpenStreetMap, named or not.© OpenStreetMap contributors · INPN / PatriNat · IGN
Places to walk
Parks and woods to walk in, in and around Groslay
Named parks, gardens and woods in the commune or within 400 m, the biggest and best-pathed first: Forêt domaniale de Montmorency leads, at 373 ha. Directions go to a point inside.
Espace naturel régional de la Butte Pinson
Park or garden · 0 m outside the commune
83 ha12.1 km of path
2 h 40 minto walk all 12.1 km of path
2.1 km southfrom the center
Promenade transversaleChemin des RosesSentier sous le Jardin+3 paths
Directionsto a point inside
Parc Salvador Allende
Park or garden · 0 m outside the commune
1.2 ha0.4 km of path
1.2 km southfrom the center
Directionsto a point inside
Parc Rosy Varte
Park or garden
0.9 ha0.3 km of path
Centralin the middle of Groslay
Directionsto a point inside
Entrée de ville Leclerc
Park or garden · 320 m outside the commune
1 ha
1.7 km south-eastfrom the center
Directionsto a point inside
Parc Marcel Glo
Park or garden
0.4 ha0.2 km of path
Centralin the middle of Groslay
Directionsto a point inside
Parc des Gallerands
Park or garden
0.3 ha0.2 km of path
0.6 km south-westfrom the center
Directionsto a point inside
Source: © OpenStreetMap contributors (ODbL): named parks, gardens and woods; sizes are the whole site.
Protected areas
Sites de Seine-Saint-Denis is the nearest protected area, 4.7 km away
The protected areas reaching the commune, and the nearest: national parks, regional nature parks, nature reserves and Natura 2000 sites.
Natura 2000 site
Sites de Seine-Saint-Denis
4.7 km from the town center
Share of the commune’s land
Any protected area0%
Designations overlap (a regional park can hold a Natura 2000 site), so the rows don’t add up; the first counts each piece of land once.
Source: INPN / PatriNat, protected areas July 2026, Natura 2000 December 2024; shares of IGN’s commune boundary.
Footpaths and woods
Footpaths and woods in Groslay
Paths, bridleways, steps and tracks open on foot, and waymarked hiking routes, mapped on OpenStreetMap inside the commune; woods are mapped forest and woodland, private woods included.
Footpaths
13 km
4.3 km per km²
Hiking routes
6 km
waymarked: 1.9 km per km²
Woodland
15%
about 0.5 km² of mapped woods
Km per km² of the commune · mapped on OpenStreetMap
GroslayVal-d'Oise medianFrance median
Footpaths4.3
Hiking routes1.9
02.55 km per km²
Share of the land · mapped woods and forest
GroslayVal-d'Oise medianFrance median
Woodland15%
0%50%100%
That is more than in 87% of compared French towns for footpaths per km², and for woodland more than in 53% of compared French towns. Hiking routes often follow paths and lanes already counted, so the two lengths overlap: don’t add them. Every home in Groslay is within 800 m of a mapped park or wood, as in most French towns.
4 named hiking routes within 2 km
GR de PaysPR (local walk)Other named walk
GRP de la Ceinture Verte, étape 12 : La Forêt de Montmorency5.8 km
PR 65.1 km
Sentier des Lisières3.8 km
Via Sancti Martini - Chemin d'Utrecht0.7 km
Source: © OpenStreetMap contributors (ODbL), extracts of October 25, 2026 (Geofabrik).
When to get out
The best walking months in Groslay: April to September
Météo-France’s 1991–2020 normals at Le Bourget, 6 km away, and the daylight at the town’s latitude. Outlined months have long days, highs of 15 to 30 °C and little rain for the place.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 8.7 | 10.1 | 11.7 | 13.6 | 15.3 | 16.2 | 15.8 | 14.4 | 12.5 | 10.7 | 9.1 | 8.2 |
| High (°C) | 8 | 9 | 13 | 16 | 20 | 23 | 26 | 25 | 22 | 17 | 11 | 8 |
| Rain (mm) | 47 | 41 | 44 | 43 | 61 | 54 | 56 | 53 | 45 | 57 | 54 | 63 |
February is the driest month (41 mm) and July the warmest (highs of 26 °C). 63 mm of rain falls in December, the wettest month. Frost comes on about 37 nights a year. The climate in Groslay →
Neighbors
Next to Groslay
The nearest towns of 2,500 or more, colored by the share of their land in protected areas.
Saint-Brice-sous-ForêtMontmagnySarcellesMontmorencyDeuil-la-BarreVilletaneuseGroslay
Under 1%1–10 %10–25 %25–50 %50 %+
| Town | Protected | Woodland | Paths (km/km²) |
|---|---|---|---|
| Groslay | 0% | 15% | 4.3 |
| Saint-Brice-sous-Forêt 15,063 · 1.4 km | 0% | 24% | 3.3 |
| Montmagny 15,105 · 2 km | 0% | 25% | 4.4 |
| Sarcelles 59,173 · 2.1 km | 0% | 6.9% | 4.9 |
| Montmorency 21,763 · 2.3 km | 0% | 20% | 3.8 |
| Deuil-la-Barre 23,099 · 2.6 km | 0% | 6.1% | 4.6 |
| Villetaneuse 12,530 · 3.3 km | 0% | 5.1% | 11 |
Saint-Brice-sous-Forêt and Montmagny are more wooded.
How to read these numbers
What this data can and can’t tell you
- Protected areas. National-park cores, national parks’ outer areas, regional nature parks, nature reserves and Natura 2000 sites, from INPN. A national park’s core is strictly protected; its outer area and a regional park are charters between communes, not bans. Designations overlap, so the total counts each piece of land once.
- Woodland. Forest and woods as OpenStreetMap maps them, private woods included: woods nobody has mapped are missing, and a mapped wood isn’t necessarily open to walkers.
- Footpaths and hiking routes. Footpaths, bridleways, steps and tracks open on foot, then waymarked hiking routes (GR and others) measured apart. A route often follows a path or lane already counted: the two overlap. Paths nobody has mapped are missing.
- Green space nearby. The share of residents (INSEE’s 200 m grid) within 800 m, as the crow flies, of a mapped park, garden or wood edge. It measures nearness, not a way in. Guadeloupe and French Guiana have no grid: their pages say whether the town center is within 800 m.
- The coast. The straight-line distance from the town center to OpenStreetMap’s coastline, which follows the tide line into estuaries. A commune is on the coast when the coastline crosses its boundary.
- No grade yet. U.S. and UK towns have an Outdoors Grade; French towns don’t yet. Each figure is set beside the median of compared communes (those with an overall grade) in the département and in France, each figure its own median.
Questions about the outdoors in Groslay
Is Groslay in a national or regional nature park?
No. The nearest protected area is Sites de Seine-Saint-Denis, 4.7 km from the town center.
Are there good walks in Groslay?
OpenStreetMap maps 13 km of footpaths and tracks open on foot in the commune, 4.3 km per km² (the median compared town: 1.7 km per km²); 6 km of waymarked hiking routes cross it.
How much of Groslay is woodland?
15% of the commune is mapped woodland, private woods included; the median compared French town has 13%.
Is Groslay near the sea?
No: the coast is 138 km from the town center, as the crow flies.
When is the best time for walking in Groslay?
April to September: long days, mild highs and little rain, from Météo-France’s 1991–2020 normals at the nearest suitable station.
Why is there no Outdoors Grade for French towns?
TownRatings grades the outdoors in the U.S. and the UK; the French figures are new and not graded yet. This page sets each one beside the median compared French town instead.
Sources: INPN / PatriNat (protected areas 2026, Natura 2000 2024) · © OpenStreetMap contributors, ODbL (paths, hiking routes, woods, coast, gardens) · INSEE, Filosofi 2021 200 m grid (residents) · IGN Admin Express (boundaries) · Météo-France normals 1991–2020 · Medians and percentiles: TownRatings, over compared French towns, updated November 4, 2026. Under the Licence Ouverte / Open Licence 2.0 (Etalab).
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.