Season & Weather Guide
Best Time for Borasu Pass Expedition — Month-by-Month Guide
June is optimal for snow-bridge stability, while September offers 100% air clarity and the best views of the Swargarohini and Kinnaur Kailash massifs.
Seasonal Overview
Borasu Pass is a 'High-Risk Technical window' trek. It is only doable in June and September.
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Peak Season
june, september
Off Season
july, august
Month-by-Month Trail Guide
January
Conditions
Fatal. Pass buried in 30ft snow.
Crowds
none
Inaccessible
Closed. Extremely high crevasse danger and lethal avalanche risk during peak winter.
February
Conditions
Closed.
Crowds
none
Pass closed
March
Conditions
Closed. Snow depth non-negotiable.
Crowds
none
Avalanche hazard
April
Conditions
Extreme Snow. Not recommended.
Crowds
low
Lethal snow-bridges
May
Conditions
Exploratory Opening. High failure rate.
Crowds
low
Deep un-consolidated snow
June
RecommendedConditions
The First window. Snow depth helps in the vertical ascent (kick-stepping). Best for summit success.
Crowds
medium
Ideal for technical trekkers. Glacial snow is stable enough for crampon use.
July
Conditions
Monsoon risky. Baspa road prone to landslides.
Crowds
none
Monsoon danger
August
Conditions
Monsoon peak.
Crowds
none
Monsoon danger
September
RecommendedConditions
The Gold Standard. Air clarity is 100%. Best for experienced climbers.
Crowds
medium
Best air clarity for photography of the Tibetan border peaks and Baspa skyline.
October
Conditions
Autumn Cold. Risk of sudden blizzards.
Crowds
low
Blizzard risk
November
Conditions
Winter starts. Fatal wind-chill.
Crowds
none
Expert only
December
Conditions
Closed.
Crowds
none
Pass closed
Important Tips
Crossing Borasu is a legal inter-state transit; dual-state permits are mandatory.
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Help us keep this data ground-truth accurate.
This encyclopedia entry for Borasu Pass Expedition is curated from a mix of public survey records, first-hand climber accounts, and official permit logs. However, mountains are dynamic. If you have been on this route recently and noticed a change in terrain, water availability, or local regulations, we want to hear from you.
Community Vetted
Last Verified: May 2026
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