{"id":705,"date":"2010-02-08T09:36:19","date_gmt":"2010-02-08T14:36:19","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=705"},"modified":"2020-12-04T21:20:37","modified_gmt":"2020-12-04T21:20:37","slug":"frost-tolerances","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/growing-cranberries\/frost-tolerances\/","title":{"rendered":"Frost Tolerances"},"content":{"rendered":"

Cranberry Spring and Fall Frost Tolerances <\/strong>(from a table first developed by C. J. DeMoranville, UMass Cranberry Station, 1997, and revised appropriately in the years since that time; last revised in 2019):<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Spring Cranberry Frost Tolerances<\/th>\n<\/tr>\n
Appearance of the bud<\/strong><\/th>\nEarly Black & Howes varieties<\/strong><\/span><\/th>\nBen Lear, Stevens, & new hybrid varieties<\/strong><\/span><\/th>\n<\/tr>\n<\/thead>\n
Spring dormant (bud reddish)<\/td>\n18\u00b0F<\/td>\n20\u00b0F<\/td>\n<\/tr>\n
White bud stage (loss of dormant color in the bud)<\/td>\n20\u00b0F<\/td>\n22\u00b0F<\/td>\n<\/tr>\n
Loosening of bud scales (Bud Swell Stage)<\/td>\n22\u00b0F<\/td>\n25\u00b0F*<\/td>\n<\/tr>\n
Bud Break (cabbage head or popcorn stage); 2mm bud<\/td>\n25\u00b0F*<\/td>\n27\u00b0F**<\/td>\n<\/tr>\n
Bud elongation (Bud is growing out\/up)<\/td>\n27\u00b0F**<\/td>\n29.5-30\u00b0F<\/td>\n<\/tr>\n
Roughneck (more than 1\/2″ new growth) through hook stage<\/td>\n29.5-30\u00b0 F<\/td>\n29.5-30\u00b0 F<\/td>\n<\/tr>\n
Hook Stage and Bloom (flower buds fully expanded and open)<\/td>\n29.5-30\u00b0 F<\/td>\n29.5-30\u00b0 F<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* = After 5-7 days, increase tolerance to 27\u00b0 F even if there is no change\u00a0in appearance.
\n<\/span>** = After 5-7 days, increase tolerance to 29.5\u00b0-30\u00b0 F even if there is no change in appearance.<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Fall Cranberry Frost Tolerances<\/strong><\/th>\n<\/tr>\n
Maturity Level of the Fruit
\n<\/strong><\/th>\n		Early Black<\/strong><\/th>\nHowes<\/strong><\/th>\nStevens<\/strong><\/th>\nBen Lear<\/strong><\/th>\n<\/tr>\n<\/thead>\n
Deep blush on exposed surface<\/td>\n27\u00b0 F<\/td>\n27\u00b0 F<\/td>\n27\u00b0 F<\/td>\n27\u00b0 F<\/td>\n<\/tr>\n
Deep blush<\/td>\n26\u00b0 F<\/td>\n26\u00b0 F<\/td>\n26\u00b0 F<\/td>\n26\u00b0 F<\/td>\n<\/tr>\n
Red<\/td>\n25\u00b0 F<\/td>\n25\u00b0 F<\/td>\n25\u00b0 F<\/td>\n25\u00b0 F<\/td>\n<\/tr>\n
Deep red<\/td>\n23\u00b0 F<\/td>\n23\u00b0 F<\/td>\n23\u00b0 F<\/td>\n24\u00b0 F<\/td>\n<\/tr>\n
Maroon (1-2 weeks later)<\/td>\n23\u00b0 F<\/td>\n20\u00b0 F<\/td>\n22\u00b0 F<\/td>\n24\u00b0 F<\/td>\n<\/tr>\n
Over-ripe (end of October)<\/td>\n23\u00b0 F<\/td>\n23\u00b0 F **<\/td>\n23\u00b0 F **<\/td>\n24\u00b0 F<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

** = loss of tolerance when over-ripe<\/p>\n

Please note that each variety will reach a given stage on a different<\/em> date.<\/strong> Generally, Early Black and Ben Lear will both color early and Howes and Stevens will color later.\u00a0 This tolerance chart is based on color <\/em>development, which is used as a visual guide to ripening, a chemical and physiological process.\u00a0In some years, lower tolerances were found.\u00a0However, we cannot predict when this will occur so conservative figures are presented here.\u00a0In each of three years, cranberries showed tolerances at least as low as these for the stages listed.<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Cranberry Spring and Fall Frost Tolerances (from a table first developed by C. J. DeMoranville, UMass Cranberry Station, 1997, and revised appropriately in the years since that time; last revised in 2019): Spring Cranberry Frost Tolerances Appearance of the bud Early Black & Howes varieties Ben Lear, Stevens, & new hybrid varieties Spring dormant (bud […]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":236,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"templates\/page-withsidebar.php","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-705","page","type-page","status-publish","hentry"],"yoast_head":"\nFrost Tolerances - Cooperative Extension: Cranberries - University of Maine Cooperative Extension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/extension.umaine.edu\/cranberries\/growing-cranberries\/frost-tolerances\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Frost Tolerances - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Cranberry Spring and Fall Frost Tolerances (from a table first developed by C. 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