Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to March 15​, 2026​​​​​​​​​

​Location​​
​Mod 50°F
Corn development, 
Codling moth, 
European corn borer​​
​2025 GDDs
Mod base 50F
​30-yr avg.

1991-2020


​Sine B48
Alfalfa weevil
​Mod B40
Onion maggot
​Simple B50
Flea beetles, Imported cabbageworm,​ Squash vine borer
​Simple B52
Colorado potato beetle, Corn rootworm adults
​​Simple B43
Cabbage maggot
​Sine B39
Seedcorn maggot
​​Mod B38
​Western bean cutworm
Dubuque IA
68
63
21
57
184
15
10
73
166
222
Lone Rock52
53
39
156
7
5
37
131
189
​​Beloit
69
49
22
53
178
10
6
58
156
212
Sullivan52
46
40
150
9
7
41
130
178
Madison50
45
18
41
153
9
7
45
133
183
Juneau
42
47
33
137
8
6
33
116
163
Racine66
46
54
166
13
9
62
149
199
Waukesha49
43
40
144
9
7
41
127
173
Milwaukee56
49
15
48
154
13
10
54
136
185
Hartford
44
40
14
35
137
8
6
37
119
164
Appleton26
35
10
20
95
6
4
17
78
118
Green Bay28
36
9
21
92
5
3
17
75
113
Big Flats​35
52
27
121
9
7
19
95
144
Ha​ncock​29
45
12
24
110
9
7
18
87
133
P​t Edwards22
46
18
98
7
5
14
75
119
La Crosse38
54
19
32
136
9
6
33
117
163
Eau Claire22
41
12
17
93
2
0
13
74
116
Cumberland
2
25
6
2
47
0
0
2
36
62
Bayfield0
24
0
35
0
0
0
21
46
Wausau10
29
9
9
60
3
1
10
45
77
Medford7
28
5
6
54
0
0
7
40
70
​Crivitz
21
29
16
73
5
3
13
55
92
Crandon​5
19
4
47
0
0
4
32
60
​Key​ to GDD calculation methods: Modified B50°F; 2025 Modified B50°F; 30-Year Average 1991-2020; Sine B48°F; Modified​​ B40°F; Simple B50​​°F; Simple B52°F; Simple B43°F, Sine B39°F; Modified B38°F.   ​ ​ ​ ​ ​ ​ ​ ​ ​ 

​​​​​​​​​​​​​<< Back to main Pest Survey page​​​
​​​​
​
​



​
​