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Please note: The GDD models have only been “ground-truthed” in the Great Lakes region. Use of models outside of this region, including the North East and northern Great Plains, should be used with caution. We do not recommend the GDD models we use for the mid-southern transition zone and southern states.

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Group Memberships or State-wide Sponsorships

Please contact the GDD Tracker team for information about group membership or sponsoring a whole state.