Planting planner: Simi Valley, California
Typical last spring frost December 31 (1 spring in 10 later than January 27). Typical first fall frost December 30 (1 fall in 10 earlier than December 9). Growing season about 365 days.
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Frost comes in fewer than half of years here (about 22 years in 100), so we don't build a planting calendar around it: in most years there is no last frost to plant after. Your county's extension office publishes planting dates made for your climate.
January
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February
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March
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April
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May
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June
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July
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August
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September
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October
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November
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December
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Dates from NOAA's 1991 to 2020 climate normals for Van Nuys Airport (station USW00023130), 15 miles from the center of Simi Valley. Planting rules: Colorado State University Extension GardenNotes #720 (spring), Virginia Cooperative Extension 426-334 (fall crops), University of Minnesota Extension (garlic). Spring bulbs: plant when the soil has cooled to about 50 to 55°F, until a couple of weeks before the ground freezes (University of Wisconsin–Madison Extension). Full details: https://lastfrostdate.com/frost-dates/california/simi-valley/