The GDD numbers at State Bog (East Wareham, MA) through May 6 are as follows:
Dee model (base 44℉ and Jan 1): 204.6
WI simple (base 41℉ and April 7): 235.7
WI complex (base 41℉, max 86℉ and April 7): 282.1
Growing Degree Days
Growing Degree Day (GDD) models help to predict when to start monitoring for frost and the tolerance temperature at which the cranberries should be protected. The GDD numbers above are indicated for State Bog, East Wareham and the GDD numbers at your location may be a little different depending on where you are in the state. The CCCGA Frost Committee uses the GDD models as a tool but also relies on traditional visual observation. The models are still being evaluated as they work better in some years than others. Don’t rely on these exclusively. They should only be used as another guide in understanding how the season is progressing, helping growers make more informed frost decisions. Below are key models being used:
Irving DeMoranville (Dee) model
- Dee model: 44°F base temperature; accumulate starting from Jan 1. When 100 GDD is reached, be extra vigilant for frost and white bud stage is expected.
University of WI models – accumulate starting from 13-hour day (starts on April 7)
- WI Simple model: 41°F base temperature. When 90-100 GDD is reached, be extra vigilant for frost and dormant phase should have ended.
- WI Complex model: Temperatures between 41°F and 86°F; if minimum temperature is less than 41°F, set to 41°F and if maximum temperature is more than 86°F, set to 86°F. When 90-100 GDD is reached, be extra vigilant for frost and dormant phase should have ended.
The GDD numbers at State Bog (East Wareham, MA)
Growing Degree Days 5/7/26
Growing Degree Days 5/4/26
The GDD numbers at State Bog (East Wareham, MA) through May 3 are as follows:
Dee model (base 44℉ and Jan 1): 169.5
WI simple (base 41℉ and April 7): 191.6
WI complex (base 41℉, max 86℉ and April 7): 237.4
Growing Degree Days 4/28/26
The GDD numbers at State Bog (East Wareham, MA) through April 27 are as follows:
Dee model (base 44℉ and Jan 1): 138.2
WI simple (base 41℉ and April 7): 142.3
WI complex (base 41℉, max 86℉ and April 7): 184.5
Growing Degree Days 4/22/26
The GDD numbers at State Bog (East Wareham, MA) through April 22 are as follows:
Dee model (base 44℉ and Jan 1): 121.1
WI simple (base 41℉ and April 7): 114.1
WI complex (base 41℉, max 86℉ and April 7): 143.9
Growing Degree Days 4/19/26
The GDD numbers at State Bog (East Wareham, MA) through April 19 are as follows:
Dee model (base 44℉ and Jan 1): 121.1
WI simple (base 41℉ and April 7): 110.2
WI complex (base 41℉, max 86℉ and April 7): 131.8
Growing Degree Days 4/15/26
The GDD numbers at State Bog (East Wareham, MA) though Wednesday, April 15 are as follows:
Dee model (base 44℉ and Jan 1): 83.4
WI simple (base 41℉ and April 7): 60.5
WI complex (base 41℉, max 86℉ and April 7): 80.6
Growing Degree Days 4/14/26
The GDD numbers at State Bog (East Wareham, MA) through April 13 are as follows:
Dee model (base 44℉ and Jan 1): 48.9
WI simple (base 41℉ and April 7): 20.0
WI complex (base 41℉, max 86℉ and April 7): 40.1
Growing Degree Days 4/8/26
The GDD numbers at State Bog (East Wareham, MA) through April 7 are as follows:
Dee model (base 44℉ and Jan 1): 37.4
WI simple (base 41℉ and April 7): 0
WI complex (base 41℉, max 86℉ and April 7): 4.8
Growing Degree Days 4/1/26
The GDD numbers at State Bog (East Wareham, MA) through March 31 are as follows:
Dee model (base 44℉ and Jan 1): 27.0
WI simple (base 41℉ and April 7): 0
WI complex (base 41℉, max 86℉ and April 7): 0
Growing Degree Days 3/25/26
The GDD numbers at State Bog (East Wareham, MA) through March 24 are as follows:
Dee model (base 44℉ and Jan 1): 13.7
WI simple (base 41℉ and April 7): 0
WI complex (base 41℉, max 86℉ and April 7): 0