One of the first steps you take when you are determining your gardening schedule is find your 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.

One way of estimating when it's a good idea to plant oxalis is to examine the USDA zone info for Tiffin.

Planting Calendar for Oxalis

Frost tolerance for oxalis:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You can not plant oxalis until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant oxalis in Tiffin 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. Starting your oxalis indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Tiffin. You should expect an average low temperature of -10°F in the coldest months of winter.

Keep in mind that USDA zone info for Tiffin may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Tiffin it frosts late in the year after April 15 so make sure that you are ready to cover your oxalis in the event of one of those late frosts.

USDA Zone Info for Tiffin

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°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 -5°F.

Plants to Grow in Tiffin

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