A Record Long Growing Season; At Least in One Spot

October 16, 2014

Have you noticed what is missing this October?  Frost!  Not here in the metro area, but elsewhere.  Only the higher parts of Central and Eastern Oregon have seen frost so far.  It hasn’t even been close west of the Cascades.  Considering we have lots more above average nights in our 7 Day Forecast, that means many areas that should have had a frost by now are seeing an unusually long growing season this year.

Tim Dearden from Trout Lake WA (north of Hood River) says there has still been no frost since April 28th at that ~2,000′ location.  He looked up the records and found that Trout Lake Ranger Station is already 15+ days ahead of its longest growing season ever!  He too noticed that nights have been much warmer than normal during the summer and early fall.  If you’ve ever been to Trout Lake, troutlake it should be obvious to you that there is no urban heat island in that location!

Tim took the numbers and plotted out the growing season length over the past 90 years.

Plot

Isn’t that interesting?  It appears the growing season IN THAT LOCATION is averaging 2-4 weeks longer than 100 years ago. I don’t have the time to research it, but I’m wondering if it’s mainly the fall dates that are changing the past 30 years at least and not the spring dates.  I was thinking it might be related to summer warmth that seems to be spreading into early fall more often.

I’d love to see how the numbers look for a few other rural locations, like maybe Corvallis, Aurora, or Hillsboro (still mainly rural at airport).  Someone get to work on some spreadsheets!