The farm shop is open from late July through to Halloween, 10-5. Naturally enough, the pumpkin patch and corn maze are fall affairs... consult their Facebook page for availability.
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21231 Johnson Rd, West Linn, OR 97068 [Google map].
The good people of Yelp have posted 10 reviews of Fiala Farms corn maze and pumpkin patch with an average rating of 4 out of 5.