The days to maturity for sweet potatoes will vary with variety, and ranges between about 90 days to 140. If you know the variety that you are growing, count out the recommended days from the time you planted for a guideline as to when to harvest. For example, if you planted on May 15, and you had a 120-day variety, you would harvest around the middle of September. Some gardeners harvest early sweet potatoes in late summer, when they are about 1-1/2 to 2 inches long, but others wait until they are of a more mature size, usually harvesting around September/October, when the leaves start to yellow, or there is a light frost, but before there is a killing frost and before soil temperatures drop to 55F and below. It will depend on your climate. For a general guideline for your area, visit the following page and type in your zip code — it will give you a chart with planting and harvesting dates for various crops, including sweet potatoes.
The days to maturity for sweet potatoes will vary with variety, and ranges between about 90 days to 140. If you know the variety that you are growing, count out the recommended days from the time you planted for a guideline as to when to harvest. For example, if you planted on May 15, and you had a 120-day variety, you would harvest around the middle of September. Some gardeners harvest early sweet potatoes in late summer, when they are about 1-1/2 to 2 inches long, but others wait until they are of a more mature size, usually harvesting around September/October, when the leaves start to yellow, or there is a light frost, but before there is a killing frost and before soil temperatures drop to 55F and below. It will depend on your climate. For a general guideline for your area, visit the following page and type in your zip code — it will give you a chart with planting and harvesting dates for various crops, including sweet potatoes.
/gardening/planting-calendar