Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Cathedral City you can figure out when it's the best time to plant welsh onion by checking out the USDA zone info.

Planting Calendar for Welsh onion

Frost tolerance for welsh onion:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant welsh onion a bit earlier in the year because they are one of those plants that can tolerate a tiny bit of cold weather.

The earliest that you can plant welsh onion in Cathedral City is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant welsh onion and expect a good harvest is probably September. You probably don't want to wait any later than that or else your welsh onion may not have a chance to fully mature. If you are starting your welsh onion indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Cathedral City. You can expect an average low temperature of 25°F in the coldest months of winter.

It's important to remember that USDA zone info for Cathedral City may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Cathedral City you get surprised by a frost after February 15 so just be sure to be ready to cover your welsh onion in the event of one of those late frosts.

USDA Zone Info for Cathedral City

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°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 30°F.

Plants to Grow in Cathedral City

You may be interested in your other planting guides for Cathedral City.