Avalanche Risk in Colorado

All Colorado counties ranked by FEMA National Risk Index avalanche score

Avalanche risk — fast-moving snow and debris sliding down steep mountain slopes — is rated for 43 of 64 Colorado counties in FEMA's National Risk Index. Summit County carries the state's highest avalanche score at 99.0, with $11M in expected annual avalanche losses.

23 Colorado counties are rated High or Very High for avalanche, and expected annual losses from avalanche total roughly $96M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Avalanche

#CountyAvalanche ScoreRatingAnn. Freq.Ann. Loss
1 Summit County
99.0
Very High 1.07 / yr $11M
2 Pitkin County
98.8
Very High 1.40 / yr $11M
3 Clear Creek County
98.0
Very High 0.87 / yr $8M
4 Eagle County
96.3
Very High 1.23 / yr $6M
5 Gunnison County
96.2
Very High 1.27 / yr $7M
6 Jackson County
95.9
Very High 0.37 / yr $4M
7 San Juan County
95.8
Very High 0.80 / yr $6M
8 Chaffee County
95.3
Very High 0.30 / yr $5M
9 Grand County
95.0
Very High 0.93 / yr $5M
10 San Miguel County
93.7
High 1.00 / yr $4M
11 Ouray County
93.3
High 0.53 / yr $3M
12 Dolores County
92.3
High 0.43 / yr $2M
13 Rio Blanco County
92.0
High 0.13 / yr $2M
14 Larimer County
91.8
High 0.20 / yr $3M
15 Mineral County
90.2
High 0.13 / yr $2M
16 Mesa County
90.1
High 0.17 / yr $2M
17 Garfield County
89.6
High 1.33 / yr $2M
18 Conejos County
88.7
High 0.20 / yr $1M
19 Lake County
88.6
High 0.13 / yr $2M
20 La Plata County
88.5
High 0.47 / yr $2M
21 Rio Grande County
88.3
High 0.07 / yr $959K
22 Montezuma County
88.2
High 0.40 / yr $1M
23 Boulder County
87.3
High 0.63 / yr $2M
24 Saguache County
84.8
Medium 0.17 / yr $848K
25 Routt County
84.6
Medium 0.20 / yr $1M
26 Alamosa County
83.3
Medium 0.03 / yr $457K
27 Montrose County
79.7
Medium 1.07 / yr $378K
28 Delta County
79.5
Medium 0.70 / yr $311K
29 El Paso County
79.1
Medium 0.03 / yr $457K
30 Hinsdale County
78.7
Medium 0.90 / yr $241K
31 Gilpin County
78.1
Low 0.40 / yr $131K
32 Jefferson County
77.9
Low 0.40 / yr $131K
33 Archuleta County
77.8
Low 0.37 / yr $72K
34 Park County
77.6
Low 0.40 / yr $131K
35 Las Animas County
77.3
Low 0.03 / yr $46K
36 Moffat County
61.7
Very Low 0.20 / yr $2K
37 Fremont County
31.1
Very Low 0.01 / yr $94
38 Costilla County
29.5
Very Low 0.01 / yr $57
39 Huerfano County
25.9
Very Low 0.01 / yr $49
40 Custer County
22.2
Very Low 0.01 / yr $72
41 Teller County
12.9
Very Low 0.01 / yr $18
42 Pueblo County
10.4
Very Low 0.01 / yr $9
43 Douglas County
9.6
Very Low 0.01 / yr $11

43 Colorado counties with measurable avalanche risk. See the national avalanche ranking or all Colorado counties by overall risk.

Frequently Asked Questions

Which Colorado county has the highest avalanche risk?

Summit County has the highest FEMA avalanche risk score in Colorado at 99.0 (Very High), with $11M in expected annual losses and about 1.07 events per year.

How many Colorado counties face significant avalanche risk?

43 Colorado counties record measurable avalanche risk in FEMA's National Risk Index; 23 of them are rated High or Very High.

Other Hazards in Colorado