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When to plant kale in Riverside

How to grow KaleRiverside climate
Where are you growing?

Comfortable

Comfortable in greenhouse

Comfortable in a cold frame

Kale in Riverside is a good fit outdoors. The suitable growing window of 180 days covers the 50–70 days this plant usually needs.

When to plantJanuary 1 – February 25; December 25 – February 18

Harvest
February 20 – May 6
Season vs crop
180 grow days vs 50–70 needed
Typical frost (last spring – first fall)
February 5

Kale in Riverside is a good fit outdoors. The suitable growing window of 180 days covers the 50–70 days this plant usually needs.

Planting conditions

Kale planting activities across the year: Direct sow, HarvestJFMAMJJASOND
  • Direct sow
  • Harvest
Local activity windows for this place and growing method.
Suitable growing days in a row180
Days to harvest50–70 days from seed
Jan 1 – Feb 25
Direct sow
Feb 20 – May 6
Harvest
ActivityWindowNotes
Direct sowJan 1 – Feb 25Plant outdoors in this window.
HarvestFeb 20 – May 6Expected harvest from typical days to harvest.
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 (59 – 81 °F) and tolerable (39 – 86 °F) ranges.

Kale 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 dateJanuary 1
Direct sow windowJanuary 1 – February 25
Suitable growing windowDecember 25 – June 22 (180 days)
Expected harvestFebruary 20 – May 6

How these dates are judged

Ideal conditions
Daytime air from 59 – 81 °F.
Suitable conditions
Daytime air from 39 – 86 °F.
Last frost and first frost
Typical spring and fall frost dates for Riverside, shown in the key dates.
Days to harvest
50–70 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 Kale: Jan 1 – Jun 22; Dec 25 – Jun 22 (353 days)

Planting window for Kale: Jan 1 – Feb 25; Dec 25 – Feb 18 (112 days)

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 4–30 °CTolerable 39–86 °FIdeal 15–27 °CIdeal 59–81 °FWindowGrowingJan 1 – Jun 22; Dec 25 – Jun 22PlantingJan 1 – Feb 25; Dec 25 – Feb 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 1 · Jan 1 – Jan 4

Average 40 to 62 °F · Possible 31 to 79 °F

Growing: tolerable

Planting: suitable

A week is in range when its average low and high sit inside the tolerance band 39 to 86 °F; it is suitable when that average range also overlaps the ideal 59 to 81 °F band and possible readings stay within 39 °F to 86 °F. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 39 °F makes it tolerable. 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 Kale 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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