One of my favourite topics :wink:
Here is a link that provides GDD for PNW:
http://pnwpest.org/cgi-bin/ddmodel.pl?spp=scn
Corn is the closest to tomatoes for comparison. I thought it was interesting how stages of corn growth can be compared to GDD, and starting thinking about how GDD relates to tomato growth (apart from ripening).
I have done some very basic record keeping in the past related to ripening, but perhaps will start making notes on tomato set as well.
Weather here has been unbelievable, and I have tomato set on many of my plants; Orange-1 and Purple Russian are amazing so far!!
And, for those that are interested, GDD as suggested in Territorial's 2002 catalog:
Ultra-Early: 1100 heat units (=GDD)
Extra-Early: about 1300 heat units
Early: up to 1500 heat units