Montana Avalanche Maps

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"What's the danger?" Here are autogenerated DEM Shading rules for each advisory zone that allow for quickly adding avalanche danger, problems, and sun angle layers to CalTopo maps. Reports sourced from avalanche.org.

Show Instructions

Digital Elevation Model (DEM) shading let's you create custom shading schemes based on elevation, slope, aspect and tree cover.

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Avalanche Report

Danger report updates are fetched at 7:33pm and 7:33am. The selected elevation bands are not meant to be exact, but represent a characteristic of the terrain which varies locally.

The highest band typically includes alpine areas beginning as the treeline transitions into open slopes extending to ridges and peaks.

The middle band is typically a narrow transition zone between dense forests and treeless alpine areas.

The lowest band typically extends from valley floors or snowline to near treeline.

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Usage

You'll find that Terrain Modeling in the left pane will show layers that can be turned on and edited. The right pane will show Custom Layers that can be toggled on or off.

Select A Zone: Flathead Range & Glacier NP Swan Range Whitefish Range Bridger Range Cooke City Island Park Lionhead Area Northern Gallatin Range Northern Madison Range Southern Gallatin Range Southern Madison Range Kootenai Bitterroot Rattlesnake Seeley Lake

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Pre-populated CalTopo Map

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Pre-populated CalTopo Map

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Pre-populated CalTopo Map

Flathead Range & Glacier NP
Avalanche Report

2023-04-02 Avalanche Danger

• Moderate danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

a0-0e6101-20310f fff200
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-04-02 Wind Slab

• NW to SE aspects (above 6101')
• NW to SE aspects (4401' to 6100')

a293-158e6101-20310f A200FF
a293-158e4401-6100f A200FF

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2023-04-02 Dry Loose

• All aspects (above 6101')
• All aspects (4401' to 6100')

a158-158e6101-20310f 0000FF
a158-158e4401-6100f 0000FF

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Issued at: Saturday, April 01, 2023 7:00AM
Issued by: FAC

Swan Range
Avalanche Report

2023-04-02 Avalanche Danger

• Moderate danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

a0-0e6101-20310f fff200
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-04-02 Wind Slab

• NW to SE aspects (above 6101')
• NW to SE aspects (4401' to 6100')

a293-158e6101-20310f A200FF
a293-158e4401-6100f A200FF

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2023-04-02 Dry Loose

• All aspects (above 6101')
• All aspects (4401' to 6100')

a158-158e6101-20310f 0000FF
a158-158e4401-6100f 0000FF

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Issued at: Saturday, April 01, 2023 7:00AM
Issued by: FAC

Whitefish Range
Avalanche Report

2023-04-02 Avalanche Danger

• Moderate danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

a0-0e6101-20310f fff200
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-04-02 Wind Slab

• NW to SE aspects (above 6101')
• NW to SE aspects (4401' to 6100')

a293-158e6101-20310f A200FF
a293-158e4401-6100f A200FF

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2023-04-02 Dry Loose

• All aspects (above 6101')
• All aspects (4401' to 6100')

a158-158e6101-20310f 0000FF
a158-158e4401-6100f 0000FF

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Issued at: Saturday, April 01, 2023 7:00AM
Issued by: FAC

Bridger Range
Avalanche Report

Report not available. See GNFAC for more information.

Cooke City
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Saturday, April 01, 2023 7:02AM
Issued by: GNFAC

Island Park
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Friday, March 31, 2023 6:44AM
Issued by: GNFAC

Lionhead Area
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Saturday, April 01, 2023 7:02AM
Issued by: GNFAC

Northern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Saturday, April 01, 2023 7:02AM
Issued by: GNFAC

Northern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Saturday, April 01, 2023 7:02AM
Issued by: GNFAC

Southern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Saturday, April 01, 2023 7:02AM
Issued by: GNFAC

Southern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Saturday, April 01, 2023 7:02AM
Issued by: GNFAC

Kootenai
Avalanche Report

2023-04-02 Avalanche Danger

• High danger (above 6101')
• High danger (4401' to 6100')
• High danger (below 4400')

a0-0e6101-20310f ed1c24
a0-0e4401-6100f ed1c24
a0-0e0-4400f ed1c24

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2023-04-02 Storm Slab

• All aspects (above 6101')
• All aspects (4401' to 6100')
• All aspects (below 4400')

a158-158e6101-20310f A200FF
a158-158e4401-6100f A200FF
a158-158e0-4400f A200FF

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Issued at: Saturday, April 01, 2023 9:51AM
Issued by: IPAC

Bitterroot
Avalanche Report

2023-04-02 Avalanche Danger

• Considerable danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

a0-0e6101-20310f f7941e
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-04-02 Wind Slab

• NW to SE aspects (above 6101')

a293-158e6101-20310f A200FF

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2023-04-02 Storm Slab

• All aspects (above 6101')
• All aspects (4401' to 6100')

a68-68e6101-20310f 0000FF
a158-158e4401-6100f 0000FF

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Issued at: Saturday, April 01, 2023 6:58AM
Issued by: WCMAC

Rattlesnake
Avalanche Report

2023-04-02 Avalanche Danger

• Considerable danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

a0-0e6101-20310f f7941e
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-04-02 Wind Slab

• NW to SE aspects (above 6101')

a293-158e6101-20310f A200FF

Copy to clipboard

2023-04-02 Storm Slab

• All aspects (above 6101')
• All aspects (4401' to 6100')

a68-68e6101-20310f 0000FF
a158-158e4401-6100f 0000FF

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Issued at: Saturday, April 01, 2023 6:59AM
Issued by: WCMAC

Seeley Lake
Avalanche Report

2023-04-02 Avalanche Danger

• Considerable danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

a0-0e6101-20310f f7941e
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

Copy to clipboard

2023-04-02 Wind Slab

• NW to SE aspects (above 6101')

a293-158e6101-20310f A200FF

Copy to clipboard

2023-04-02 Storm Slab

• All aspects (above 6101')
• All aspects (4401' to 6100')

a68-68e6101-20310f 0000FF
a158-158e4401-6100f 0000FF

Copy to clipboard

Issued at: Saturday, April 01, 2023 6:59AM
Issued by: WCMAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	83 by 1 Copy to clipboard
2023-04-02 08:50AM Shade	100 by 16 Copy to clipboard
2023-04-02 10:20AM Shade	119 by 30 Copy to clipboard
2023-04-02 11:50AM Shade	143 by 41 Copy to clipboard
2023-04-02 01:20PM Shade	173 by 47 Copy to clipboard
2023-04-02 02:50PM Shade	205 by 44 Copy to clipboard
2023-04-02 04:20PM Shade	232 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	253 by 22 Copy to clipboard
2023-04-02 07:20PM Shade	270 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	83 by 1 Copy to clipboard
2023-04-02 08:50AM Shade	100 by 16 Copy to clipboard
2023-04-02 10:20AM Shade	119 by 30 Copy to clipboard
2023-04-02 11:50AM Shade	143 by 41 Copy to clipboard
2023-04-02 01:20PM Shade	173 by 47 Copy to clipboard
2023-04-02 02:50PM Shade	205 by 44 Copy to clipboard
2023-04-02 04:20PM Shade	232 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	252 by 22 Copy to clipboard
2023-04-02 07:20PM Shade	270 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:30AM Shade	85 by 2 Copy to clipboard
2023-04-02 09:00AM Shade	102 by 17 Copy to clipboard
2023-04-02 10:30AM Shade	121 by 30 Copy to clipboard
2023-04-02 12:00PM Shade	145 by 41 Copy to clipboard
2023-04-02 01:30PM Shade	176 by 46 Copy to clipboard
2023-04-02 03:00PM Shade	207 by 43 Copy to clipboard
2023-04-02 04:30PM Shade	233 by 34 Copy to clipboard
2023-04-02 06:00PM Shade	254 by 20 Copy to clipboard
2023-04-02 07:30PM Shade	271 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:10AM Shade	83 by 1 Copy to clipboard
2023-04-02 08:40AM Shade	100 by 16 Copy to clipboard
2023-04-02 10:10AM Shade	118 by 31 Copy to clipboard
2023-04-02 11:40AM Shade	142 by 43 Copy to clipboard
2023-04-02 01:10PM Shade	173 by 49 Copy to clipboard
2023-04-02 02:40PM Shade	207 by 46 Copy to clipboard
2023-04-02 04:10PM Shade	234 by 36 Copy to clipboard
2023-04-02 05:40PM Shade	254 by 22 Copy to clipboard
2023-04-02 07:10PM Shade	270 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:10AM Shade	84 by 1 Copy to clipboard
2023-04-02 08:40AM Shade	100 by 17 Copy to clipboard
2023-04-02 10:10AM Shade	119 by 32 Copy to clipboard
2023-04-02 11:40AM Shade	143 by 44 Copy to clipboard
2023-04-02 01:10PM Shade	175 by 50 Copy to clipboard
2023-04-02 02:40PM Shade	208 by 47 Copy to clipboard
2023-04-02 04:10PM Shade	235 by 36 Copy to clipboard
2023-04-02 05:40PM Shade	255 by 22 Copy to clipboard
2023-04-02 07:10PM Shade	271 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-01 07:20AM Shade	85 by 1 Copy to clipboard
2023-04-01 08:50AM Shade	101 by 17 Copy to clipboard
2023-04-01 10:20AM Shade	119 by 32 Copy to clipboard
2023-04-01 11:50AM Shade	144 by 44 Copy to clipboard
2023-04-01 01:20PM Shade	176 by 50 Copy to clipboard
2023-04-01 02:50PM Shade	210 by 46 Copy to clipboard
2023-04-01 04:20PM Shade	236 by 36 Copy to clipboard
2023-04-01 05:50PM Shade	255 by 21 Copy to clipboard
2023-04-01 07:20PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	85 by 2 Copy to clipboard
2023-04-02 08:50AM Shade	101 by 18 Copy to clipboard
2023-04-02 10:20AM Shade	120 by 33 Copy to clipboard
2023-04-02 11:50AM Shade	144 by 45 Copy to clipboard
2023-04-02 01:20PM Shade	177 by 50 Copy to clipboard
2023-04-02 02:50PM Shade	210 by 47 Copy to clipboard
2023-04-02 04:20PM Shade	236 by 36 Copy to clipboard
2023-04-02 05:50PM Shade	256 by 21 Copy to clipboard
2023-04-02 07:20PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	85 by 2 Copy to clipboard
2023-04-02 08:50AM Shade	101 by 18 Copy to clipboard
2023-04-02 10:20AM Shade	120 by 33 Copy to clipboard
2023-04-02 11:50AM Shade	145 by 44 Copy to clipboard
2023-04-02 01:20PM Shade	177 by 50 Copy to clipboard
2023-04-02 02:50PM Shade	210 by 46 Copy to clipboard
2023-04-02 04:20PM Shade	236 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	256 by 21 Copy to clipboard
2023-04-02 07:20PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	85 by 2 Copy to clipboard
2023-04-02 08:50AM Shade	101 by 18 Copy to clipboard
2023-04-02 10:20AM Shade	120 by 33 Copy to clipboard
2023-04-02 11:50AM Shade	144 by 44 Copy to clipboard
2023-04-02 01:20PM Shade	177 by 50 Copy to clipboard
2023-04-02 02:50PM Shade	210 by 46 Copy to clipboard
2023-04-02 04:20PM Shade	236 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	256 by 21 Copy to clipboard
2023-04-02 07:20PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	85 by 2 Copy to clipboard
2023-04-02 08:50AM Shade	101 by 18 Copy to clipboard
2023-04-02 10:20AM Shade	120 by 33 Copy to clipboard
2023-04-02 11:50AM Shade	145 by 45 Copy to clipboard
2023-04-02 01:20PM Shade	177 by 50 Copy to clipboard
2023-04-02 02:50PM Shade	210 by 46 Copy to clipboard
2023-04-02 04:20PM Shade	236 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	256 by 21 Copy to clipboard
2023-04-02 07:20PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	85 by 2 Copy to clipboard
2023-04-02 08:50AM Shade	101 by 18 Copy to clipboard
2023-04-02 10:20AM Shade	120 by 33 Copy to clipboard
2023-04-02 11:50AM Shade	144 by 45 Copy to clipboard
2023-04-02 01:20PM Shade	177 by 50 Copy to clipboard
2023-04-02 02:50PM Shade	210 by 46 Copy to clipboard
2023-04-02 04:20PM Shade	236 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	256 by 21 Copy to clipboard
2023-04-02 07:20PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:30AM Shade	84 by 1 Copy to clipboard
2023-04-02 09:00AM Shade	101 by 16 Copy to clipboard
2023-04-02 10:30AM Shade	120 by 30 Copy to clipboard
2023-04-02 12:00PM Shade	144 by 41 Copy to clipboard
2023-04-02 01:30PM Shade	174 by 47 Copy to clipboard
2023-04-02 03:00PM Shade	206 by 44 Copy to clipboard
2023-04-02 04:30PM Shade	232 by 35 Copy to clipboard
2023-04-02 06:00PM Shade	253 by 21 Copy to clipboard
2023-04-02 07:30PM Shade	270 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:30AM Shade	85 by 2 Copy to clipboard
2023-04-02 09:00AM Shade	101 by 17 Copy to clipboard
2023-04-02 10:30AM Shade	120 by 32 Copy to clipboard
2023-04-02 12:00PM Shade	144 by 43 Copy to clipboard
2023-04-02 01:30PM Shade	176 by 49 Copy to clipboard
2023-04-02 03:00PM Shade	209 by 45 Copy to clipboard
2023-04-02 04:30PM Shade	235 by 35 Copy to clipboard
2023-04-02 06:00PM Shade	255 by 21 Copy to clipboard
2023-04-02 07:30PM Shade	272 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:30AM Shade	85 by 2 Copy to clipboard
2023-04-02 09:00AM Shade	102 by 17 Copy to clipboard
2023-04-02 10:30AM Shade	121 by 32 Copy to clipboard
2023-04-02 12:00PM Shade	145 by 43 Copy to clipboard
2023-04-02 01:30PM Shade	177 by 48 Copy to clipboard
2023-04-02 03:00PM Shade	209 by 45 Copy to clipboard
2023-04-02 04:30PM Shade	235 by 34 Copy to clipboard
2023-04-02 06:00PM Shade	255 by 20 Copy to clipboard
2023-04-02 07:30PM Shade	272 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:20AM Shade	83 by 1 Copy to clipboard
2023-04-02 08:50AM Shade	100 by 16 Copy to clipboard
2023-04-02 10:20AM Shade	119 by 30 Copy to clipboard
2023-04-02 11:50AM Shade	143 by 42 Copy to clipboard
2023-04-02 01:20PM Shade	174 by 48 Copy to clipboard
2023-04-02 02:50PM Shade	206 by 45 Copy to clipboard
2023-04-02 04:20PM Shade	233 by 35 Copy to clipboard
2023-04-02 05:50PM Shade	253 by 22 Copy to clipboard
2023-04-02 07:20PM Shade	270 by 7 Copy to clipboard

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