The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of figuring out when it's possible to plant oxalis is to refer to the USDA zone info for Westminster.

Planting Calendar for Oxalis

Frost tolerance for oxalis:	Not tolerant of frost.
When to plant:	After the last frost.

Oxalis require warm weather which means that it's important to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant oxalis in Westminster is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant oxalis and expect a good harvest is probably August. You probably don't want to wait any later than that or else your oxalis may not have a chance to fully mature. You can get started a little bit earlier by starting your oxalis indoors.

Last Frost Date

The average date of last frost is April 15 in Westminster. You can expect an average low temperature of 0°F in the coldest months of winter.

Since the USDA zone info for Westminster is an average the actual date of last frost can change quite a bit from year to year. Since half of the time in Westminster last frost occurs after April 15 be ready to cover your oxalis in the event of a surprise late frost.

USDA Zone Info for Westminster

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Westminster

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