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.

It's possible to estimate when it's the best time to plant arctotis by referring to the USDA zone info for Marshalltown.

Planting Calendar for Arctotis

Frost tolerance for arctotis:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since arctotis do well in moderate cold you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant arctotis in Marshalltown is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant arctotis and expect a good harvest is probably September. Any later than that and your arctotis may not have a chance to really do well. You can get started a few weeks earlier by starting your arctotis indoors.

Last Frost Date

The average date of last frost is April 15 in Marshalltown. In the coldest months of winter you can expect an average low temperature of -20°F.

Remember that USDA zone info for Marshalltown is just an average and the actual date of last frost is different every year. Half of the time in Marshalltown you get a frost after April 15 so make sure that you are ready to cover your arctotis if you have a late frost.

USDA Zone Info for Marshalltown

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Marshalltown

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