What a lovely, charming photo of a world gone by... wintertime, but not too cold.
Unfortunately there doesn't seem to be much that's dateable in the photo. The men are wearing working clothes that probably didn't change much in about 60 years...the only thing is the girl's dress, and most of it isn't visible.
The oldest man looks like he's wearing a style of whiskers that came into vogue in the 1860s and remained popular for quite a while with older men. Because of this and what I can see of the girl's dress, which isn't much, I would hazard a wild guess at about 1880-1890 or so for the photo. Of course you may get other guesses.
Is there anything printed on the back? If there is, could we see a scan please?
Cheers,
China