When to plant swiss chard in Riverside
Comfortable
Comfortable in greenhouse
Comfortable in a cold frame
Swiss chard in Riverside is a good fit outdoors. The suitable growing window of 183 days covers the 55–65 days this plant usually needs.
When to plantJanuary 8 – July 9
- Harvest
- March 4 – July 9
- Season vs crop
- 183 grow days vs 55–65 needed
- Typical frost (last spring – first fall)
- February 5
Swiss chard in Riverside is a good fit outdoors. The suitable growing window of 183 days covers the 55–65 days this plant usually needs.
Planting conditions
- Direct sow
- Harvest
| Activity | Window | Notes |
|---|---|---|
| Direct sow | Jan 8 – Jul 9 | Plant outdoors in this window. |
| Harvest | Mar 4 – Jul 9 | Expected harvest from typical days to harvest. |
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 – 90 °F) ranges.
Key dates
How these dates are judged
- Ideal conditions
- Daytime air from 59 – 81 °F.
- Suitable conditions
- Daytime air from 39 – 90 °F.
- Last frost and first frost
- Typical spring and fall frost dates for Riverside, shown in the key dates.
- Days to harvest
- 55–65 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 Swiss chard: Jan 8 – Jul 9 (183 days)
Planting window for Swiss chard: Jan 8 – Jul 9 (183 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.
- 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 2 · Jan 5 – Jan 11
Average 40 to 64 °F · Possible 32 to 73 °F
Growing: tolerable
Planting: suitable
A week is in range when its average low and high sit inside the tolerance band 39 to 90 °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 90 °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
- Radish Planting dates
- Arugula Planting dates
- Spinach Planting dates
- Lettuce Planting dates
- Kale Planting dates
- Beet Planting dates
- Zucchini Planting dates
- Cucumber Planting dates
- Green bean Planting dates
- Tomato Planting dates
- Bell pepper Planting dates
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 Swiss chard 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).