Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to March 22, 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
111
82
32
97
255
39
29
123
236
296
Lone Rock81
69
64
207
18
13
66
180
245
​​Beloit
99
61
34
79
228
21
13
88
205
267
Sullivan74
56
58
193
14
10
60
169
224
Madison75
58
30
62
198
19
14
72
178
233
Juneau
59
57
46
174
12
8
46
149
204
Racine89
54
73
209
17
11
82
187
247
Waukesha71
51
57
186
13
9
57
164
220
Milwaukee80
57
25
66
198
17
12
72
175
233
Hartford
62
49
23
49
176
11
7
50
153
206
Appleton35
36
18
27
118
6
4
25
97
144
Green Bay35
37
16
26
112
5
3
22
92
137
Big Flats​51
60
40
158
12
8
31
127
185
Ha​ncock​45
52
22
36
143
12
8
30
116
170
P​t Edwards36
52
29
133
9
5
26
104
158
La Crosse68
67
31
58
190
21
15
66
169
222
Eau Claire43
48
20
33
136
7
3
31
112
164
Cumberland
17
28
11
14
79
3
1
17
64
99
Bayfield4
24
4
52
0
0
2
35
66
Wausau19
30
16
15
87
3
1
17
67
108
Medford16
29
11
13
81
0
0
14
62
101
​Crivitz
24
29
18
89
5
3
13
67
112
Crandon9
19
7
64
0
0
6
46
81
​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.   ​ ​ ​ ​ ​ ​ ​ ​ ​ 

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