One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The best time to plant nasturtium in Oskaloosa can be determined by referring to the USDA zone info.

Planting Calendar for Nasturtium

Frost tolerance for nasturtium:	Not tolerant of frost.
When to plant:	After the last frost has passed.

You should not plant nasturtium until after the last frost when the weather gets warmer because they do not do well in cold weather.

The earliest that you can plant nasturtium in Oskaloosa 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 nasturtium and expect a good harvest is probably August. Any later than that and your nasturtium may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your nasturtium indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Oskaloosa. In the coldest months of winter you can expect an average low temperature of -15°F.

Keep in mind that USDA zone info for Oskaloosa is an average and the actual date of last frost is different every year. Since half of the time in Oskaloosa it frosts late in the year after April 15 be ready to protect your nasturtium in the event of a surprise late frost.

USDA Zone Info for Oskaloosa

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 Oskaloosa

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