Frost-Tolerant Vegetables: Hardy, Semi-Hardy and Sensitive Crops
“Frost tolerant” is not one universal category. Nebraska and North Carolina Extension group crops by the cold they can tolerate, and some crops appear in different groups. Their lists are useful regional guidance, not a promise that a particular plant will survive a particular night.
How the two lists describe crops
| Group | Nebraska Extension (UNL) | North Carolina Extension |
|---|---|---|
| Semi-hardy | Beets, mustard, radishes, spinach, Swiss chard, green onions | Beets, cabbage, cauliflower, celery, collards, green onions, potatoes, leaf lettuce, mustard, parsnips, radishes, spinach, Swiss chard |
| Hardy | Cabbage, carrots, turnips, rutabagas, kale | Broccoli, garden peas, spinach, cabbage, carrots |
| Sensitive / frost-tender examples | Corn, beans, cucumbers, tomatoes, squash | Tomatoes, squash, cucumbers, eggplant, melons, okra, peppers, pumpkins, sweet corn and sweet potatoes, among other examples |
The difference matters: UNL lists cabbage as hardy. North Carolina's article names cabbage in both its semi-hardy list and its hardy examples. Keep both classifications visible rather than choosing one as the national answer. Region, cultivar, plant age and conditions affect what a gardener observes.
UNL describes semi-hardy vegetables as tolerating light frost at 30–32 °F. Hardy vegetables tolerate repeated frosts but are killed near 20 °F. Its frost-tender examples are corn, beans, cucumbers, tomatoes and squash.
Use dates as planning signals
The first-frost date page explains the NOAA 10%, 50% and 90% dates. For a cautious harvest plan, the 10% first-freeze date is the earliest of those three dates; check the forecast as it approaches. The frost protection guide summarizes the NC Extension cover guidance.
UNL recommends selecting short-season cultivars by the “days to maturity” information on the seed packet when planning fall vegetables. Use that packet information with the first-frost date; this page does not assign maturity times to crops.
Sources
- University of Nebraska–Lincoln Extension, Fall Vegetable Gardening (G1343), revised March 2012.
- N.C. Cooperative Extension, Madison County, How Do I Protect My Garden From Frost?.