Guides
Season extension
Season extension here is named-source method notes — not a frost guarantee. Methods stay on the cited cards. This page does not sell a product.
One source per card. Named-source examples — not a national season-extension rule.
Illustrative photograph — not a cited bed.
What the sources say — at a glance
One source per card. Facts are not averaged.
Maryland Extension (Maryland)
Weather protection. Low tunnels 15–30 in. Drape and secure.
Details and limits (4)
Method
Maryland Extension (Maryland): covering vegetable plantings for weather protection. Method.
Method
Maryland Extension (Maryland): a low tunnel is a miniature version that uses much shorter arches. Low tunnels 15 to 30 inches high, with hoops spaced 2 to 4 feet apart.
Method
Maryland Extension (Maryland): drape the row cover over the frame and secure it to the ground along the sides and at each end. Method.
Limit
Maryland weather-and-pest-protection sheet. Named methods — not a product.
Maryland Extension (Maryland)
Named figure on the Maryland sheet.
Details and limits (2)
Method
Maryland Extension (Maryland): extend the growing season in spring and fall by providing 2 to 8 °F of frost protection. Named on their sheet — not a BioArva promise.
Limit
Maryland vegetable-garden weather sheet. Named figure — not a frost guarantee or BioArva promise.
UMN Extension (Minnesota)
Shallow unheated box. Transparent cover. Hinged lid to vent.
Details and limits (3)
Method
UMN Extension (Minnesota): a cold frame consists of a shallow, unheated box with a transparent cover.
Method
UMN Extension (Minnesota): the lid must be on a hinge so that you can vent the cold frame during the day.
Limit
Minnesota extending-the-growing-season page. Named methods — not a product.
UMN Extension (Minnesota)
Low tunnel supports. Drape and anchor. Open on warm days.
Details and limits (3)
Method
UMN Extension (Minnesota): use the same fabrics from floating row covers with semi-circular supports to form a low tunnel. Heavy-gauge wire cut in three to five foot pieces; ends 16 to 32 inches apart; insert six inches deep; a wire section every three feet.
Method
UMN Extension (Minnesota): drape the row cover over the hoops and anchor at the sides. On warm sunny days, leave the end open; close the tunnel overnight. Method.
Limit
Minnesota extending-the-growing-season page. Named methods — not a product.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
Verified suppliers only
No supplier on this page
When a partner is listed, it will be outbound and disclosed. Nothing to buy here. Fertilizer, soils, and pesticides stay off this slot.
Illustrative photograph — not a cited bed.
Indoor starts also sit beside seed starting indoors.
How we know — methodology. Ranges and assertions are cited per source, not blended.