I would not plant any till fall when it is cooler , and maybe some rain will fall

Hi Suzi - Thanks for getting back. How about Asian pear or European plum or peach, would they grow in LA and do they require lot of water?

Drought resistant does not mean low water requirements.

Jit, of all the fruit trees, I don't know about Asian pears or European plums or peaches. I have a great plum and a questionable peach (planted by previous owners). But they survive well with our low chill winters.

From USDA website I find my house is in plating zone 10b: 35 to 40 F. Is there a website which tells me the fruit trees suitable for that plant hardiness zone? Thanks in advance!

you live in the land of fun and sun, as long as you can keep things watered, you pretty much can grow any kind of fruit trees you want (even some sub tropicals), specifically LOW CHILL varieties.

Molex - what is a low chill variety? As you know we may be land of sun and fun but as long as those fun types don't require too much water given the drought in the state

all fruit trees need a certain amount of "chilling hours", an amount of hours where the temperature is between 34 and 42 degrees or something, each variety has its own set amount of chill hours required to have a chance of fruiting, w/o adequate chilling the internal parts of the flower will not form properly and pollination will not occur. There are very few drought tolerant fruit trees. you will have to water.

locate your annual average chill hours then, do some research on varieties that meet those required hours.

http://fruitsandnuts.ucdavis.edu/Weather_Services/chilling_accumulation_models/about_chilling_units/

Good low chill choices for you: http://www.davewilson.com/home-gardens/fruit-variety-recommendations/toms-picks-winners-low-chill-southwest

I recommend that you read this article on irrigation: http://homeorchard.ucanr.edu/The_Big_Picture/Irrigation/
Also, this web-site: http://homeorchard.ucanr.edu in general is a great resource for any backyard orchardist in California. Another useful resource is the web-site of Dave Wilson Nursery: http://www.davewilson.com