Growing Degree Days

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​January 1 to February 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
14
4
2
10
57
0
0
9
46
72
Lone Rock11
4
7
45
0
0
1
33
58
​​Beloit
15
3
3
10
48
0
0
6
38
60
Sullivan11
2
7
42
0
0
2
32
50
Madison13
3
1
9
46
0
0
6
37
56
Juneau
9
3
6
39
0
0
1
30
46
Racine13
1
9
48
0
0
6
38
60
Waukesha9
2
6
40
0
0
1
31
50
Milwaukee11
4
0
8
44
0
0
5
35
55
Hartford
9
2
1​​​
6
38
0
0
1
30
45
Appleton2
2
0
1
21
0
0
0
15
28
Green Bay2
2
0
1
19
0
0
0
13
25
Big Flats​7
3
4
29
0
0
0
19
35
Ha​ncock​4
2
0
3
24
0
0
0
16
30
P​t Edwards3
1
2
22
0
0
0
13
27
La Crosse6
4
1
4
34
0
0
0
25
44
Eau Claire2
0
0
1
17
0
0
0
11
22
Cumberland
0
0
0
0
8
0
0
0
5
12
Bayfield0
0

0
10
0
0
0
5
13
Wausau0
0
0
0
10
0
0
0
6
14
Medford0
0
0
0
9
0
0
0
5
12
​Crivitz
1
0
1
15
0
0
0
9
20
Crandon0
0
0
10
0
0
0
6
13
​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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