Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Midlothian you can estimate when to plant welsh onion by reviewing the USDA zone info.

Planting Calendar for Welsh onion

Frost tolerance for welsh onion:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Welsh onion tend to make it in very little cold which tells us that you can plant them slightly earlier in the year than other frost tender plants.

The earliest that you can plant welsh onion in Midlothian is March. However, you really should wait until April if you don't want to take any chances.

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

Last Frost Date

On average all chance of frost has passed is on April 15 in Midlothian. In the coldest months of winter you should expect an average low temperature of -15°F.

Since the USDA zone info for Midlothian is just an average the actual date of last frost is different every year. Since half of the time in Midlothian you get a frost after April 15 be ready to protect your welsh onion in the event of one of those late frosts.

USDA Zone Info for Midlothian

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

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

Plants to Grow in Midlothian

You may be interested in your other planting guides for Midlothian.