Here in the sunny northland, permanent ice fishing houses have to be off the lake by March 15 and yard work starts about April 15. You can safely plant annuals about a week after Memorial Day. Most tree companies do some work year round, a lot of municipal pruning and line clearing are done then. Usually the first frost is around the middle of Sept. (can be late August) and the first major snow usually is sometime around Halloween. Fargo and Bismarck are down in the state's "banana belt" so they will be about one to two weeks earlier.
Right now we are setting around the greenhouse waiting for the bananas to ripen and working on our tans for the summer. The orchids and bougainvillea (sp) are blooming and all is well with the world. Temp is pushing +20 already at 7am, so a heat wave is in progress. Spring must be close behind.
Bob in North Dakota