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Seasonal Overview

An extreme, high-altitude pass (16,500 ft) connecting the Chamba and Lahaul valleys. The operational window is incredibly brief. Heavy snow blocks the pass until mid-July, and monsoon rains make the lower Chamba approach highly dangerous. The only truly optimal time is late August to September.

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The September Sweet Spot

Key point

In September, the snow bridges melt, revealing the crevasses. Paradoxically, this makes the glacier SAFER to cross because you can see the traps.

Season at a Glance

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Recommended
Open / Shoulder
Closed / No data

Month-by-Month Trail Guide

January

Conditions

Deep winter. The pass is buried and inaccessible.

Crowds

none

Impassable winter snowpack.

-19C to -4CSnow: Very HighSky Clarity:

Closed. Extreme winter conditions.

February

Conditions

Deep winter. The pass is buried and inaccessible.

Crowds

none

Impassable winter snowpack.

-17C to -2CSnow: Very HighSky Clarity:

Closed. Extreme winter conditions.

March

Conditions

Heavy residual snow covers the approach. Avalanche danger remains high.

Crowds

none

High avalanche exposure.

-7C to 8CSnow: HighSky Clarity:

Early season. Deep snow accumulations.

April

Conditions

Spring melt makes the steep approaches highly unstable.

Crowds

none

Unstable snowpack.

-3C to 12CSnow: HighSky Clarity:

Early season. Deep snow accumulations.

May

Conditions

The pass retains massive snow cornices and remains uncrossable.

Crowds

none

Hidden cornices and deep snow.

1C to 16CSnow: MediumSky Clarity:

Prime pre-monsoon window. Good snow stability.

June

Conditions

While weather warms, the 16,500 ft altitude ensures the pass remains blocked by snow.

Crowds

none

Snow blocking the pass.

4C to 19CSnow: MediumSky Clarity:

Prime pre-monsoon window. Good snow stability.

July

Conditions

Monsoon rains arrive, making the lower Chamba approach incredibly muddy and prone to landslides.

Crowds

none

Severe rain and landslide risk on approach.

6C to 17CSnow: LowSky Clarity:

Peak season in rain shadow. River crossings swell.

August

Recommended

Conditions

The brief window opens. The snow has melted enough to allow a safe crossing into Lahaul.

Crowds

low

5C to 16CSnow: LowSky Clarity:

Peak season in rain shadow. River crossings swell.

September

Recommended

Conditions

The absolute premier window. Stable weather, clear skies, and safe snow conditions on the pass.

Crowds

low

1C to 14CSnow: LowSky Clarity:

Crystal clear skies. Best visibility of the year.

October

Conditions

Temperatures plummet and early winter snows rapidly close the high pass.

Crowds

none

Extreme cold and early route closure.

-4C to 10CSnow: LowSky Clarity:

Crystal clear skies. Best visibility of the year.

November

Conditions

Winter storms arrive, effectively closing the route.

Crowds

none

Severe cold and route closure.

-9C to 5CSnow: HighSky Clarity:

Winter setting in. Sub-zero temperatures rapid.

December

Conditions

The route is abandoned for the winter season.

Crowds

none

Impassable winter snowpack.

-18C to -3CSnow: Very HighSky Clarity:

Closed. Extreme winter conditions.

Timing makes or breaks a trek. Send this to your group before you decide.

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