Cumbers dying?
 

I planted Burpless cucumbers this spring and have been harvesting quite a
few, but it appears the plants are dying.
How long do they normally live? They are planted in half-whiskey barrels and
grew like crazy and, like I said, have put out a lot.
Is it too late to start more from seed and expect more before frost? I live
in Toledo, Oh, zone 2, I think

Thanks
Jimmy