When to Plant Oxalis in Harvard, IL

The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Harvard you can determine when you can plant oxalis by using the USDA zone info.


Planting Calendar for Oxalis

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

You can not plant oxalis until after all chance of frost has passed because they require warm weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant oxalis
Possibly ok, but a risky time to plant oxalis
Probably not a good time to plant oxalis

The earliest that you can plant oxalis in Harvard 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. If you wait any later than that and your oxalis may not have a chance to really do well. If you are starting your oxalis indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost is on April 15 in Harvard. You can expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Harvard may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Since half of the time in Harvard it frosts late in the year after April 15 be ready to cover your oxalis in the event of a late frost.

USDA Zone Info for Harvard

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 Harvard

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