No one around here has ever seen anything like this. The last few years the first frost has been very late around the 3rd week of Sept.
We usually have a pretty big differential from night to day. Highs in the high 80 to low 90's then, high 40's or low 50's at night. This caught everyone by surprise. Needless to say it sure stops things from growing, especially Alfalfa.
This year we had 68 frost free days. Try raising anything with that kind of growing season.
BTW we are at 7050 feet elevation. That's high but not that high. This valley is surrounded by 14,000 foot peaks so our weather is usually very moderate, as the mountain ranges deflect a lot of the big storms.