🚦 Opening / closure pattern

• Officially open all year in normal conditions. 
• Temporary closures happen during heavy snowfalls or avalanche risk. 
• It belongs to the category of lower-high Alpine passes (<2000 m), which are typically rideable April/May → October depending on snow. 

🌦️ Typical weather through the year (cyclist-focused)

• Usually too cold for enjoyable cycling at high altitude. 
• Snow, ice patches, short daylight, and wind chill common. 
• Even if road is open, it may be unsafe for bikes.

• Highly variable: sun one day, cold rain or snow the next. 
• Snowbanks may still line roads above ~2000 m. 

• Best conditions overall. 
• Warm valleys but summit can be ~20 °C colder (≈6.5 °C drop per 1000 m). 
• Afternoon thunderstorms possible. 

• Still warm early autumn (≈21 °C Sept avg high regionally). 
• Rain increases and first snow possible late season. 

🌬️ Additional hazards specific to this pass

• 16 sharp hairpins on route. 
• French side cycling section is officially restricted due to rockfall risk. 

📊 Seasonal rideability overview

🧭 Practical planning tips

• Temperature difference valley → summit can exceed 20 °C on hot days. 
• Weather changes rapidly in high mountains. 
• Even when open, conditions may become unsafe quickly.

✅ Short summary