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When to plant zucchini in Riverside

How to grow ZucchiniRiverside climate
Where are you growing?

Comfortable

Not realistic in greenhouse

Comfortable in a cold frame

Zucchini in Riverside is a good fit outdoors. The suitable growing window of 103 days covers the 45–60 days this plant usually needs.

When to plantApril 24 – June 18

Harvest
June 8 – August 17
Season vs crop
103 grow days vs 45–60 needed
Typical frost (last spring – first fall)
February 5

Zucchini in Riverside is a good fit outdoors. The suitable growing window of 103 days covers the 45–60 days this plant usually needs.

Planting conditions

Zucchini planting activities across the year: Direct sow, HarvestJFMAMJJASOND
  • Direct sow
  • Harvest
Local activity windows for this place and growing method. Blue fill is usually too cold for this plant.
Suitable growing days in a row103
Days to harvest45–60 days from seed
Apr 24 – Jun 18
Direct sow
Jun 8 – Aug 17
Harvest
ActivityWindowNotes
Direct sowApr 24 – Jun 18Plant outdoors in this window.
HarvestJun 8 – Aug 17Expected harvest from typical days to harvest.
Blue fill is usually too cold for this plant. Adjust a week or two for your conditions.

Planting and growing across the year

Planting is the sow / plant-out window. Growing is daytime air versus this plant’s ideal (70 – 90 °F) and tolerable (55 – 95 °F) ranges.

Zucchini planting and growing weeks in RiversideJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
Planting uses sow / plant-out rules (frost, soil germination, night, and last-sow): green when plantable, blue diagonal when nights or soil are too cold, amber cross-hatch when too hot, faint for other calendar limits. Growing shows daytime air against this plant’s ideal and tolerable ranges across the year.

Key dates

Typical last spring frostFebruary 5
Safer last spring frostFebruary 5
Frost-free daysNot yet (short archive)
Outdoor sow dateApril 24
Direct sow windowApril 24 – June 18
Suitable growing windowApril 24 – August 4 (103 days)
Expected harvestJune 8 – August 17

How these dates are judged

Ideal conditions
Daytime air from 70 – 90 °F.
Suitable conditions
Daytime air from 55 – 95 °F.
Last frost and first frost
Typical spring and fall frost dates for Riverside, shown in the key dates.
Days to harvest
45–60 days from seed, from typical days to harvest.
Sowing window
Dated sow and harvest bars use frost dates, soil minima, night limits, and last-sow count-back from typical crop timing. The year strip and weekly chart use the same window: air ratings only colour weeks inside it.

Growing window for Zucchini: Apr 24 – Aug 4 (103 days)

Planting window for Zucchini: Apr 24 – Jun 18 (56 days)

Usually too cold: Oct 19 – Dec 31

Outdoors: weekly temperatures and windows

Temperatures across the year for Riverside. Shaded bands are this plant’s ideal and tolerable daytime air ranges. Growing is daytime air suitability; Planting is sow / plant-out conditions (same colour language). Window brackets mark each stretch.

JanFebMarAprMayJunJulAugSepOctNovDec−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °F40 °C104 °F50 °C122 °FTolerable 13–35 °CTolerable 55–95 °FIdeal 21–32 °CIdeal 70–90 °FWindowGrowingApr 24 – Aug 4PlantingApr 24 – Jun 18Last frost ~Feb 5
  • Ideal range
  • Tolerable range
  • Possible min to max
  • Average min to max
  • Suitable
  • Tolerable
  • Too cold
  • Too hot

Selected week · tap a week or use the arrows

Week 17 · Apr 20 – Apr 26

Average 51 to 74 °F · Possible 43 to 92 °F

Growing: too cold

Planting: too cold

A week is in range when its average low and high sit inside the tolerance band 55 to 95 °F; it is suitable when that average range also overlaps the ideal 70 to 90 °F band and possible readings stay within 32 °F to 95 °F. Crossing a possible limit, or missing the ideal band, makes it tolerable; any chance of frost (possible low below 32 °F) makes it too cold. When a sowing window is calculated, weeks outside that window are uncoloured even if air is in range.

Based on average frost dates.

Show all 53 weeks
Cover method weekly charts

Outdoor weekly chart is above. Open a cover chart only if you grow under fleece, a cold frame, or an unheated greenhouse.

Other plants for Riverside

Calculated by Plan & Plant · Method · Data 2019–2026

Frost and suitability dates are typical figures from climate statistics. Microclimates vary; they are not a guarantee.

How we calculated this
  • Data: ERA5-Land via Open-Meteo, cell 33.95, -117.40, years 2019–2026 (not a 30-year climate normal yet).
  • Typical and safer dates: Typical last frost is the date after which half of winters in this sample had no more frost; safer is later in the sample so fewer winters still frosted.
  • Crop rule: Local windows for Zucchini from frost dates, temperature ratings, and crop timing rules.
  • Confidence: Provisional — short or thin sample for this place.
  • Full methodology (algorithm 2026-10-season-6).

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