Slope Angle Analyzer
Analyze terrain steepness for backcountry planning, avalanche assessment, and route finding.
Terrain Map
Slope Analysis
Slope Angles
Aspect (Facing)
Avalanche terrain: 30-45°. N-facing slopes hold snow longer.
Understanding Slope Angles
Slope angle is one of the most important factors in avalanche terrain assessment and outdoor route planning. This tool uses high-resolution terrain data to calculate the steepness of any location on Earth.
Slope Angle Reference
0-25° (Low Angle)
Generally safe terrain. Suitable for beginners and low-risk travel. Avalanches are rare on slopes under 25°.
25-30° (Moderate)
Transition zone. Wet slides and loose snow avalanches possible. Common angle for ski runs.
30-35° (Steep)
Prime avalanche terrain. Slab avalanches become likely. Requires careful assessment and proper training.
35-45° (Very Steep)
High avalanche risk zone. Most avalanche fatalities occur on 35-40° slopes. Expert terrain only.
Use Cases
Backcountry Skiing
Plan safe routes by identifying and avoiding avalanche terrain. Find slopes that match your skill level.
Hiking & Scrambling
Assess route difficulty before heading out. Identify potential hazards and plan alternatives.
Mountain Biking
Find trails that match your ability. Understand the steepness of descents and climbs.
How It Works
- Click anywhere on the map to analyze slope at that point
- We fetch terrain elevation tiles at ~38m resolution
- Slope is calculated from the elevation gradient between neighboring points
- Toggle the overlay to see color-coded slope angles across the visible area