One of the best tools that you have as gardeners to help us determine your gardening schedule is the 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.

A way of determining when it's a good idea to plant tithonia is to examine the USDA zone info for Ogallala.

Planting Calendar for Tithonia

Frost tolerance for tithonia:	Not tolerant of frost.
When to plant:	After the last frost.

Since tithonia are not cold tolerant it is necessary to wait until after the last frost has passed before you can plant them.

The earliest that you can plant tithonia in Ogallala 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 tithonia and expect a good harvest is probably August. You probably don't want to wait any later than that or else your tithonia may not have a chance to grow to maturity. You can get started a little bit earlier by starting your tithonia indoors.

Last Frost Date

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

Always keep in mind that the actual date of last frost is an average because it is based on the USDA zone info for Ogallala and it can change quite a bit from year to year. Since half of the time in Ogallala it frosts late in the year after April 15 be ready to cover your tithonia if you have a late frost.

USDA Zone Info for Ogallala

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 Ogallala

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