One of the first steps you take when you are getting a good idea 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.

A common way of making a decision about when it's possible to plant zinnia is to refer to the USDA zone info for Ogden.

Planting Calendar for Zinnia

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

You really shouldn't plant zinnia until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant zinnia in Ogden 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 zinnia and expect a good harvest is probably August. You probably don't want to wait any later than that or else your zinnia may not have a chance to grow to maturity. If you are starting your zinnia indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Ogden. You should expect an average low temperature of 0°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Ogden is not always accurate and the actual date of last frost is different every year. Since half of the time in Ogden you get a frost after April 15 be ready to protect your zinnia if you have a late frost.

USDA Zone Info for Ogden

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Ogden

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