Were we are in New England it can stay cold until Memorial Day easily. So putting tomatoes in the ground before then can be risky while other crops do just fine. Beans, radishes and lettuce can be planted if back yard farmers take steps to protect the plants.
Hoop or ring tents work well. They can be made with metal or wood hoops and covered with clear plastic. Gardeners can also tie a sturdy line or cable between two posts about 19 inches high. Then drape plastic over it then secure the edges with rocks or stakes. Both these methods allow you to remove the covering each day then recover at night. It is very important that ventilation is provided at both ends to allow air flow. Cover the ends if frost is in the forecast.
I always say talk to the people who work at you local nursery about planting dates. The zone charts are only a basic tool to judge the last frost of the year.
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