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Frost dates for Tustin Irvine Ranch, California

Frost is rare here. In a typical year this station records no freeze at all, so there is no last-frost date to plan around and the growing season runs all year.

Growing season

All year

Hardiness zones nearby

10a, 10b

Summer days

a usual high of about 29 °C84 °F

Lettuce and spinach run to seed

May to September, in hot, long days (how we know)

Summer and rain

A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.

Nearly every drop is yours

April to October: rain brings less than a quarter of the water a growing garden needs, about 25 mm1 in a week (how we know)

Month by month

January

high ~20 °C68 °F · low ~6 °C43 °F · rain ~78 mm3.1 in

February

high ~21 °C69 °F · low ~7 °C45 °F · rain ~86 mm3.4 in

March

high ~22 °C72 °F · low ~9 °C48 °F · rain ~54 mm2.1 in

April

high ~23 °C74 °F · low ~10 °C50 °F · rain ~20 mm0.8 in

May

high ~25 °C77 °F · low ~13 °C55 °F · rain ~8.1 mm0.3 in

June

high ~26 °C80 °F · low ~15 °C58 °F · rain ~2.3 mm0.09 in

July

high ~30 °C85 °F · low ~16 °C61 °F · rain ~0.3 mm0.01 in

August

high ~31 °C87 °F · low ~17 °C63 °F · rain ~0 mm0 in

September

high ~30 °C87 °F · low ~16 °C61 °F · rain ~4.6 mm0.2 in

October

high ~29 °C84 °F · low ~13 °C55 °F · rain ~17 mm0.7 in

November

high ~24 °C76 °F · low ~8 °C47 °F · rain ~31 mm1.2 in

December

high ~21 °C70 °F · low ~6 °C43 °F · rain ~57 mm2.2 in

What to sow when

Frost is rare in Tustin Irvine Ranch, so each crop’s months follow the warmth. Each one below can go in during these months and stay in its range of temperatures all the way to harvest. Where every month runs warmer than a crop likes, it gets the coolest months here (why).

Each crop’s range of monthly temperatures is an estimate from one extension table, so treat these months as a guide.

Where these numbers come from

NOAA NCEI 1991–2020 Climate Normals, the Tustin Irvine Ranch station (listed by NOAA as Tustin Irvine Rch HCN, USC00049087), at 33.70, -117.75. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.

Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.

ZIP codes nearest this station

92602, 92603, 92604, 92606, 92610, 92612, 92614, 92617, 92618, 92620, 92630, 92676…

Nearby stations

The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.

• Santa Ana Fire Stn, CA, frost is rare
• Anaheim, CA, frost is rare
• Fullerton Municipal Airport, CA, frost is rare
• Elsinore, CA, last frost by January 28
• Long Beach Daugherty Field, CA, frost is rare
• Torrance Airport, CA, frost is rare

Other stations in California.

• Hawthorne Municipal Airport, CA, frost is rare
• Los Angeles Dwtn Usc Campus, CA, frost is rare
• Avalon Catalina Airport, CA, frost is rare
• Culver City, CA, frost is rare
• Vista, CA, frost is rare
• Santa Monica Municipal Airport, CA, frost is rare
• Wrightwood, CA, last frost by May 16
• U C L A, CA, frost is rare

All locations · All plants · Folklore, checked