One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By checking out the USDA zone info for Fort Mill you should be able to determine when it's possible to plant onions.

Planting Calendar for Onions

Frost tolerance for onions:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Onions do well in cold which means that you can start planting them much earlier than other plants that might not handle the cold.

The earliest that you can plant onions in Fort Mill is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant onions and expect a good harvest is probably September. Any later than that and your onions may not have a chance to fully mature. If you are starting your onions indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average all chance of frost has passed is on March 15 in Fort Mill. It might get as low as 10°F during the coldest months of winter.

Keep in mind that USDA zone info for Fort Mill is not always accurate and the actual date of last frost is different every year. Half of the time in Fort Mill it frosts late in the year after March 15 so just be sure to be ready to protect your onions in the event of a surprise late frost.

USDA Zone Info for Fort Mill

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in Fort Mill

You may be interested in your other planting guides for Fort Mill.