northwoods . . .
It's not that the selections Bob and I are discussing are not cold-hardy.. it's that you need to calculate your frost free days and degree heating units to satisfy your own self. Zone 3 is pushing it, o.k. Zone 4, no . . .
When you get there type in the zip code that you need information on, and set your base at 65 and select Fahrenheit
The columns show CDD (cooling degree days) total at the bottom and HDD (heating degree days) - total also at the bottom of each column.
Here is data for Aledo, IL. for example. I compared 2012 to year 2015 but year values can be changed to suit whichever years you’d like to see. This would come in very-very handy when seeing how large or small a crop of pecans/hickory for (a) given year was produced.
COOLING & HEATING DEGREE DAYS Aledo, IL
In 2012 Aledo had 1237 Cooling Degree Days (CDD) and 3434 Heating Degree Days (HDD)
In comparison year 2015 Aledo has had 1017 CDD thus far and has had 4397 HDD thus far.
What most people miss-calculate in figuring frost free days, is that pecan foliage and buds are killed at around 26 degrees, not 32 degrees. So to an accurate idea of how many growing days one has is to find out when the temperature stops falling below 28 degrees in the spring, and when it starts to fall below 28 degrees in the fall.
Bob Harper ^^^
Now for Frost Free Days
If you’d like to check other locations:
Then here’s a picture tutorial on how to achieve results:
Step 1: Click on a State
Step 2: Click on a County
Step 3: from the dropdown menu choose Section II where you currently see Section I
Step 4: Now select Climatic Data by clicking on it.
Step 5: Now select/click AgACIS (Agricultural Applied Climate Information)
Step 6: Choose the values. (Frost/freeze dates) (Location) Set Variable to 28 F (Year or Years) Then Click GO.
Lastly @northwoodswis4, A plain northern pecan rootstock is the norm which the selections Bob and I have talked about are grafted onto. Even though 'northern pecan' are typically pecans grown from places such as Missouri being one example, they are hardy thru zone 4.
Hope this all helps now!