When to Harvest Pumpkins:
• Harvest pumpkins when they are fully colored and the rinds are hard.
•The color of a mature pumpkin can vary according to variety; mature coloration can be orange, white, gray, or blue-gray.
• A mature pumpkin will have a hard, shiny shell that is not easily dented or punctured by a fingernail. The stem of a mature pumpkin will be hard and shriveled. Pumpkins will rot if harvested too young.
• Pumpkins are ready for harvest 75 to 115 days from sowing depending on the variety.
Harvest pumpkins before the first hard frost. Do not leave pumpkins in the garden if the weather turns cold and rainy or if a freeze is predicted.
If pumpkins can’t be harvested before cold and rainy weather comes, put hay or straw under them to prevent rot caused by contact with damp soil. (Earlier in the season, as the fruit is ripening, you can place a pieces of wood or tile or a pieces of cardboard or folded newspaper beneath pumpkins to prevent contact with soil and rot.)
How to Harvest Pumpkins:
• Cut pumpkins from the vine with a sharp knife or garden lopper. Leave 3 to 6 inches of stem attached to the fruit. The attached stem will protect the fruit from disease and insect attacks. Pumpkin vines can be prickly, so protect your skin by wearing gloves and long sleeves when harvesting.
• Handle pumpkins with care to avoid nicking or bruising the skin.
• Lift and carry pumpkins by slipping your hand under the bottom of the fruit. Do not lift or carry a pumpkin by the stem; a heavy pumpkin can detach from the stem, fall, and crack or break. Stemless pumpkins do not store well.
• Clean harvested pumpkins with soapy water to remove soil and kill pathogens on the surface of the fruit; use one part chlorine bleach to ten parts water. Dry the fruit after washing and place the fruit in a dry place to cure.
How to Store Pumpkins:
Cure pumpkins by setting them in a warm place–80-85°F (26-29°C) and 80 to 85 percent relative humidity—for 10 days to two weeks. Curing will harden the skin, heal wounds, ripen immature fruit, and, importantly, improve flavor.
If frost or cold nights are predicted, cover curing pumpkins with old blankets or move them into a shed or garage.
Store cured pumpkins at about 50°F (10°C) with about 60 percent humidity, a shed or garage will do. Cool and dry are the best storage conditions for pumpkins. Pumpkins exposed to temperatures below 45°F (7°C) will soften and rot.
Cured pumpkins will keep for 2 to 3 months. Store the pumpkins so that they do not touch.
More tips: How to Grow Pumpkins.