Probably not, but I'm used to living way more north than Montana and actually more northern than London where the time change is based on for the UK. I have to say it is needed no matter the economic effect, when for over 2 months you see no sunlight what so ever during a working day it has an abysmal effect on worker efficiency.

I have only observations to base this on, but workers start dropping off well before 'flu season'. I do a lot of work outside and I find the comments about DST harming farming to be irrelevant; the main one is that harvesting labour becomes in efficient as crops have to be harvested after the dew. If I didn't need workers at 6am I'd tell them to come in at 7 or 8am when the crops are ready to be harvested. That's just common sense; if I'm working outside, I'm not going until it's safe for me to do it and if its too dark I'll tell the customer I'm coming later, if they don't like it lump it.

Although, on my more hackerish note: 2 million candela torch + power inverter = sun rise at 3am. I believe it's supposed to produce sunlight-like brightness over some 450m^2, although it isn't always useful and without it being hooked up to some form of power it's out of batteries within 15 minutes.