Growing Degree Day Model for Canola (B. napus) Development
A heat driven development model based on growing degree days (GDD) is used to provide the potential plant stage for canola at the Columbia Plateau Conservation Research Station as based on several typical seeding dates.  This model is from "Using Growing Degree Days to Predict Plant Stages" (Miller, et. al., 2001) which provides a number of growing degree day models for plant development and an excellent discussion for using these models and their limitations.  For B. napus the model plant stages were provided as ranges of GDD and a mean of this range was used to predict the stage in the table below.  Both the current predicted stage and a 30 year normal for 1981 to 2010 is provided for comparison.  Winter canola development is only predicted through December 31st due to a lack of prediction potential during and after winter dormancy.  Model predictions may be disrupted due to stressors such as disease, pests, and unusual climate conditions among other factors.  This should not substitute for checking field conditions.
PDF - Miller, et al., 2001          
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Autoupdate: 7/23/2016        
Growing Degree Days are in farenheit using a base of 32 degrees.
Sowing Canola Current Crop Year 30 Year (81-10') % of normal Current Predicted 30 year Normal
Date Type Growing Degree Days Normal GDD GDD Plant Stage Plant Stage
03/15 Spring 3427 3255 105 swathing stage swathing stage
04/01 Spring 3236 3046 106 swathing stage swathing stage
04/15 Spring 2935 2822 104 swathing stage swathing stage