Big Dave's Christmas Trees 3370 Sunset Valley Rd, Moorpark, CA93021 Big Dave's Christmas Trees shop at the Underwood Family Farm is open annually, beginning the day after…More Thanksgiving through Dec. 21. The lot features a wide selection of fir trees for holiday home decor. Services available include vehicle loading, delivery, and fire-proofing of your tree. Tree nets are also available for easy and mess-free transporting. Please call to inquire about fundraising opportunities for schools, clubs, and associations.