Gray Wolf Population Trends in the Contiguous United States

Estimated trends in the abundance of free ranging gray wolves in the lower 48 United States (1963 to present). Data from published literature or official agency records.

Yearª MN WI MI Isle
Royale
(N.W.
Montana)
MT Greater
Yellowstone
WY (Central
Idaho)
ID AZ NM
1963
350-700
20
1964
25
1965
28
1966
23
1967
26
1968
16
1969
17
1970
750
0
18
1971
20
1972
736 – 950
23
1973
500 – 1000
24
1974
30
1975
41
1976
1000 – 1200
44
1977
34
1978
40
1979
1235
43
1
1980
25
50
1981
21
30
1982
27
14
1983
19
23
1984
17
24
1985
15
22
14
1986
16
20
18
1987
18
16
26
1988
28
12
31
1989
1521
31
12
30
1990
34
6
15
48
1991
40
17
12
42
1992
45
21
12
59
1993
40
30
13
88
1994
57
57
17
64
1995
83
80
16
70
14
15
.
1996
2000-2200
99
116
22
82
43
30 – 40
1997
148
112
24
75
54
68 – 71
1998
2450
178
140
14
75
80 – 85
70 – 75
11
.
1999
205
174
25
65
116b
122b
6b
2000
248
216
29
63
118
141
12
9
2001
2600
251
249
19
107
140
185
29c
3c
2002
320
280
17
84
218
261
12d
7d
2003
335-354
321
19
92
301
368
17d
6d
2004
3020
400
360
29
59
324
422
50e
50e
2005
3020
425
405
30
93
294
500-550
50e
50e
2006 465 434 30 159 314 673 35-49e 35-49e
2007 546 509 21 159 425 371 713 59e 59e
2008 2,921 549 520 23 500 846 ~50e ~50e
2009 620 577 24 524 320 835 42e 42e
2010 690 19 566 50e 50e
2011 11 653 746
2012 782-824 9 277 683 32 (total 58) 26 (total 58)
2013 2,211 809-834 658 8 625 1,500-2,000 75e 75e

a = Estimates made during the preceding winter unless noted otherwise
b = Estimates made during preceding fall
c = Numbers as of August
d = Numbers of collared wolves as of April
e = Shared population between Arizona and New Mexico