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.

By referring to the USDA zone info for Altoona you should be able to determine when to plant argyranthemum.

Planting Calendar for Argyranthemum

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

It's probably not a good idea to plant argyranthemum until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant argyranthemum in Altoona 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 argyranthemum and expect a good harvest is probably August. If you wait any later than that and your argyranthemum may not have a chance to fully mature. Starting your argyranthemum indoors is a great way to get them started a little bit earlier.

Last Frost Date

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

Since the USDA zone info for Altoona is just an average the actual date of last frost can change quite a bit from year to year. Since half of the time in Altoona you get surprised by a frost after April 15 be ready to protect your argyranthemum in the event of a surprise late frost.

USDA Zone Info for Altoona

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 Altoona

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