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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.
Pass Window
When is it climbable?
Borasu Pass is a 'High-Risk Technical window' trek. It is only doable in June and September.
Season at a Glance
Editor's Notes
May to June is ideal for snow seekers, while September to October offers stable weather and less snow.
Avoid July-August due to high landslide risks, and November-April due to extreme cold and heavy snow.
Month by Month
What each month looks like
January
Pass ClosedConditions
Fatal. Pass buried in 30ft snow.
Crowds
none
Inaccessible
Closed. Extreme winter conditions.
February
Pass ClosedConditions
Closed.
Crowds
none
Pass closed
Closed. Extreme winter conditions.
March
Pass ClosedConditions
Closed. Snow depth non-negotiable.
Crowds
none
Avalanche hazard
Early season. Deep snow accumulations.
April
Pass ClosedConditions
Extreme Snow. Not recommended.
Crowds
low
Lethal snow-bridges
Early season. Deep snow accumulations.
May
Conditions
Exploratory Opening. High failure rate.
Crowds
low
Deep un-consolidated snow
Prime pre-monsoon window. Good snow stability.
June
Pass OpenConditions
The First window. Snow depth helps in the vertical ascent (kick-stepping). Best for summit success.
Crowds
low
Prime pre-monsoon window. Good snow stability.
July
Conditions
Monsoon risky. Baspa road prone to landslides.
Crowds
none
Monsoon danger
Monsoon danger. Landslides and severe rains.
August
Conditions
Monsoon peak.
Crowds
none
Monsoon danger
Monsoon danger. Landslides and severe rains.
September
Pass OpenConditions
The Gold Standard. Air clarity is 100%. Best for experienced climbers.
Crowds
low
Crystal clear skies. Best visibility of the year.
October
Conditions
Autumn Cold. Risk of sudden blizzards.
Crowds
low
Blizzard risk
Crystal clear skies. Best visibility of the year.
November
Pass ClosedConditions
Winter starts. Fatal wind-chill.
Crowds
none
Expert only
Winter setting in. Sub-zero temperatures rapid.
December
Pass ClosedConditions
Closed.
Crowds
none
Pass closed
Closed. Extreme winter conditions.
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Step 3: Route Intelligence
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Now see exactly how the route unfolds day by day, including terrain types and daily altitude profiles.
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