Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. 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 Alamosa it's possible to estimate when it's a good idea to plant geranium.

Planting Calendar for Geranium

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

It's a bad idea to plant geranium until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant geranium in Alamosa 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 geranium and expect a good harvest is probably August. If you wait any later than that and your geranium may not have a chance to really do well. You can get started a little bit earlier by starting your geranium indoors.

Last Frost Date

The average date of last frost is May 15 in Alamosa. You can expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for Alamosa is just an average the actual date of last frost is different every year. Since half of the time in Alamosa there is a last frost after May 15 be ready to cover your geranium in the event of a late frost.

USDA Zone Info for Alamosa

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Alamosa

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