Our monthly suitability ratings combine several data-driven factors to estimate the best time to hike each trail. Each month receives a Good (green), Fair (amber), or Poor (red) rating based on the following:
- Passability window — Many trails have defined open seasons based on snow cover, hut/refuge availability, and official closures. Months outside a trail's passable window are automatically rated Poor.
- Temperature — We score each month's average temperature against an ideal hiking range of 7–22°C. Any month averaging below 7°C is rated Poor regardless of other factors. Temperatures above 28°C also lower ratings due to heat stress risk.
- Precipitation — Monthly rainfall patterns are assessed, with drier months scoring higher. Trails in regions with pronounced wet seasons (e.g. autumn storms on Atlantic coasts) are penalised accordingly.
- Latitude & elevation — Higher-altitude alpine trails and far-northern routes have compressed hiking seasons. We adjust for shorter snow-free windows and cooler temperatures at elevation.
- Daylight hours — For trails above 58°N (Scandinavia, Iceland, northern Scotland), we penalise months with very short days. Fewer than 8 hours of daylight significantly limits safe hiking time.
- Wind — Persistent high winds reduce comfort and safety, particularly in Iceland where wind is a year-round factor that lowers ratings across all months.
- Regional climate factors — We account for localised conditions including:
- Midge season on Scotland's west coast and Hebrides (June–August)
- Extreme summer heat in Mediterranean, southern Spain, and Turkey (July–August)
- Winter storms on exposed coastal trails like the Fisherman's Trail
- Atlantic weather patterns affecting trails in Ireland, western Norway, and Iceland
- Föhn wind effects in alpine valleys
On individual trail pages, you'll also find Historic Weather Averages showing temperature, rainfall, and wind data from the trail's actual coordinates.
