🏔️ Opening / closing pattern

• This pass is not open year-round — it’s a high alpine road typically usable only in summer months. 
• Official notices show it can be closed indefinitely when bad weather hits, even outside deep winter. 
• In one recent season it reopened late September after weather closure, showing how variable dates can be. 

👉 Like most Alpine passes above 2000 m, exact opening depends on snowfall and snow clearing — some years they stay closed until early or mid-June, and early winter storms can shut them again by autumn. 

🌦️ Seasonal conditions for cyclists

❄️ Winter (Nov–Apr)

• Temperatures often around or below freezing at altitude (example alpine-pass climate: around −2 °C day / −11 °C night in Jan). 
• Snow and ice are normal; roads can be unsafe or impassable. 
• Authorities may require winter tyres or chains in mountain areas. 

➡️ Cycling reality: basically not rideable for road bikes.
🌱 Spring (May–June)

• Snow often still present early season; roads can be wet or icy. 
• At ~2000 m elevations, daytime temps in June can still be only 5–15 °C. 
• Weather can switch quickly between sun, rain, wind, or snow. 

➡️ Cycling reality: early season gamble — check snow depth before planning.
☀️ Summer (July–Aug)

• Most reliable cycling window with warmer temperatures and longest daylight. 
• Expect afternoon storms and mountain showers. 
• Alpine summer highs generally fall roughly 12–24 °C depending on elevation. 

➡️ Cycling reality: best time overall.
🍂 Autumn (Sep–Oct)

• Often stable weather, cooler temps, and less traffic — prime cycling season. 
• Snow can start returning by late October. 

➡️ Cycling reality: excellent until first snowfall.

🌬️ What to expect on the climb (year-round traits)

• Temperature drops roughly 6–8 °C from valley to summit (typical alpine-pass gradient). 
• Strong crosswinds are common at the top. 
• Weather changes fast — clear skies can become fog, rain, or snow quickly. 
• Residual snow patches can remain even when the road is officially open. 

🚴 Practical cyclist tips

• Bring layers + windproof shell even in summer. 
• Descents can be very cold due to wind chill.
• Check local pass status the day before — closures can happen suddenly. 
• Carry food/water: high passes often have limited services. 

✅ Short summary

Col de la Lombarde is typically rideable from roughly June to October.
Best months = July–September.
Outside that window expect snow, ice, sudden weather changes, and possible closures — even if the road technically shows open.