One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant twinspur in Sioux City can be determined by checking out the USDA zone info.

Planting Calendar for Twinspur

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

Twinspur are moderately cold tolerant which tells us that you can get them planted earlier than other frost tender plants.

The earliest that you can plant twinspur in Sioux City 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 twinspur and expect a good harvest is probably September. You probably don't want to wait any later than that or else your twinspur may not have a chance to fully mature. Starting your twinspur indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In Sioux City the average date of last frost happens on April 15. You should expect an average low temperature of -20°F in the coldest months of winter.

It's important to remember that USDA zone info for Sioux City is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Sioux City you get a frost after April 15 so always be ready to protect your twinspur if you have a late frost.

USDA Zone Info for Sioux City

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 Sioux City

You may be interested in your other planting guides for Sioux City.