Planting planner: Fontana, California
Typical last spring frost January 4 (1 spring in 10 later than February 7). Typical first fall frost December 30 (1 fall in 10 earlier than December 11). Growing season about 365 days.
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Frost comes in fewer than half of years here (about 41 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 Ontario International Airport (station USW00003102), 9 miles from the center of Fontana. 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/fontana/