“What is the best time to plant corn in Northwest Oregon at Zone 8?” Question from Joseph of Milwaukie, Oregon
Answer: Your last frost date in Milwaukie, Oregon is March 31st, and your growing season is approximately 222 days long, according to the Old Farmer’s Almanac. Corn likes to germinate when the soil and growing conditions are warm, and most corn varieties take between 65 to 75 days to produce ears if there is enough sunlight, warmth, and moisture. So, I would recommend planting your corn as early as mid-April. With such a long growing season, you can also start a second planting in mid or even late May, if you have space. (Click here to learn more about successfully growing and selecting sweet corn.)
Plant corn in the ground in late spring, once the soil is warm and frosty mornings are long gone. Seeds should be planted about 2 inches deep, 8-12 inches apart, and kept lightly moist for good germination. Plant them in no less than 3 rows of 6 to ensure even pollination and good harvest. Provide full sun and tilled soil that drains well and has average fertility and a neutral pH. Working Black Gold Compost Blend into the soil before planting will increase success. Once temperatures heat up, plants will take off. Keep them well irrigated but not wet. Ears will be ready when they are plump, the husks are green, and the tassels have turned brown at the tops.
Black Gold Horticulturist