When I moved to Trinidad, Colorado to begin teaching, I was surprised that the annual precipitation was about the same as it was in Trego. Trinidad was 6,000 feet elevation – downtown Trego is a little over 3,000. Trego is definitely timber – predominately Doug Fir, and in Trinidad you still have to go up the mountain to get to the timber.
We moved to Trinidad along with the final episode of MASH – it took years for me to see that epic program – and we moved into a very arid climate. The record frosts (from Climate and Man) recorded for Fortine were May 29 and September 8. Annual precipitation was 17.43 inches. At Trinidad, the record frosts were May 2 and October 16. Annual precipitation was 16.2 inches. Trinidad showed 167 days of growing season, while Fortine showed only102 days of growing season.
Back in the late seventies, one of the foresters I listened to spoke of ‘climax species’ – essentially the trees that will remain in a location until fire wipes them out, and a succession begins. So I knew that in Trego, with 17 inches of rain and 100 days between f8rosts, Doug Fur would remain. Now, fifty-odd years later, and with the experience of Trinidad’s arid, near desert environment, I’m looking at a longer growing season. I kind of prefer the term global warming to climate change. Can’t say for sure – when Climate and Man was published, they had less than 40 years record for Fortine and Trinidad. But one thing is sure – if you spread the same amount of precipitation over more growing days, it’s a good idea to look for plants that are more drought tolerant.
I need to do more thinning – Dad like the forest unmanaged, and that was OK for his lifetime – but a longer growing season demands more space between trees, and probably a change in species – so when I can, I’m leaving Western Larch and Ponderosa Pine. They seem to be a bit more drought tolerant and fire resistant.
The hayfield, despite being partially sub-irrigated, becomes drier with a longer growing season. On the other hand, when I was a kid, raising sweet corn was a challenge. No longer.
The longer growing season may indicate a change in climate, or it may just be an anomaly. I don’t know – but I’m placing my bet on plants that are a bit more drought tolerant.

