旅大地区全年无霜期为170～210天,其中庄河县、复县、新金县无霜期不超过180天,而初霜期有时出现在9月下旬。但小麦下茬移栽高粱收获期一般在10月中、下旬。下茬套种玉米收获期在9月下旬到10月上旬,都直接受到霜冻的威胁。1974年由于初霜来得早,有25%面积的小麦下茬作物受灾减产。 Frost-free period throughout the year 170 to 210 days, of which Zhuanghe County, Fuxian County, Xin Jinxian frost-free period of not more than 180 days, and sometimes the first frost period in late September. However, the harvest of wheat under the transplanting of sorghum is generally in mid-October, late. The next harvest intercropping corn harvest in late September to early October, are directly affected by the threat of frost. As early as the early frost in 1974, 25% of the area under crops affected by wheat crop losses.