The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You will be able to figure out when it's a good idea to plant bougainvillea by referring to the USDA zone info for Ironwood.

Planting Calendar for Bougainvillea

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

Bougainvillea do not do well in cold weather which means that it's important to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant bougainvillea in Ironwood is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant bougainvillea and expect a good harvest is probably August. Any later than that and your bougainvillea may not have a chance to grow to maturity. Starting your bougainvillea indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is May 15 in Ironwood. It might get as low as -30°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Ironwood is an average and the actual date of last frost will vary from year to year. Half of the time in Ironwood you get a frost after May 15 so make sure that you are prepared to protect your bougainvillea if you have one of those late frosts.

USDA Zone Info for Ironwood

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Ironwood

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