Pea plants handle pea plants winter frost better than most garden crops, but they have limits. They can take light frost down to about 28°F (-2°C) without trouble. A hard freeze below 20°F (-7°C) that lasts more than a few hours will kill them. The key is knowing where your cold snaps fall on that scale and planning around them.
I grew a fall crop of peas that powered through three light frosts in November while my tomatoes and beans turned black overnight. The pea plants kept making pods for another 2-3 weeks after those frosts hit. Their frost tolerance surprised me because most of the garden was done for the year. The frost tolerance peas show during cool weather makes them one of the best crops to push the edges of your growing season.
Peas count as hardy annuals, which means they can handle heavy spring and fall frosts that wipe out tender crops. The best temperature range for pea growth sits between 59-68°F (15-20°C), but they keep growing well outside that window. Mature plants survive brief dips to 28°F (-2°C) without damage. Young seedlings are even tougher and can handle quick drops to 25°F (-4°C) because their small size and low water content protect them.
The danger zone starts below 20°F (-7°C). At that point, ice crystals form inside the plant cells and rupture them from within. The stems go limp, the leaves turn dark, and the plant dies within hours. A single night at 15°F (-9°C) is enough to end your entire pea crop. No amount of row cover can save plants from that level of cold.
Row covers and cold frames are your best tools for stretching the season when frost threatens. A single layer of floating row cover adds about 4-6°F (2-3°C) of protection on cold nights. Double it up and you gain even more. Cold frames made from old windows or clear plastic over a wood frame keep plants safe well into late fall.
I built a simple cold frame from scrap wood and a glass shower door I found at a yard sale. It cost me about $15 in total. My peas inside that frame kept growing through December while the ones outside froze and died in mid-November. The frame held the soil warm enough that the roots stayed active even when outside temps dropped near freezing at night.
For peas cold weather survival through winter, you need to live in zones 8-10 where hard freezes are rare. Gardeners in these mild areas can plant peas in October or November. They harvest through January or February with no trouble. The cool, frost-free winter days give peas the exact conditions they love for a long and steady harvest.
Plant your fall peas about 8-10 weeks before the first hard frost in your area. This timing lets the plants mature before the worst cold arrives. Young plants handle frost better than old ones. Getting them established early gives you the strongest shot at a late-season harvest. Watch your local forecast and cover your plants the night before any freeze warning to squeeze out every last pod of the season.
Read the full article: Growing Peas: The Full Guide
