Still a little early for Maine - likely at least a week away.
Watch the apple trees. When they start to blossom, it's time to start hunting.
Old orchards are often good areas - but be sure they have not been sprayed for at least a decade. Most (even those called organic) use fungicides which knock out most mushroom species.
If you can find an orchard that's been abandoned and gone wild, that can be a pretty good hunting spot.
-t
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