I haven't been up there, but I can tell you the weather up here has been $hit two weekends in a row. Yesterday was -1. Today 0 +1 with mix of wet snow and drizzle. Trails are soft, and believe it or not a lot of swampy areas are NOT frozen. A trail that we were working on yesterday, has 2 holes in it today from water running under the snow.
I'm thinking it's yellow because of swamp/ water crossings.
On a positive note, weather is supposed to get cold mid week, with snow. So the groomers will be able to have something to work with.