The dates in the table below were produced by a spreadsheet calculator from Johnny’s Seeds web site. This calculator determines planting dates for crops to be planted outside, without additional protection, for fall harvest. All are crops that are frost-tolerant and taste great in cooler weather.
The calculator uses this formula:
Days to Maturity (they used varieties recommended for fall/winter)
+ Average Harvest Period
+ Fall Factor (takes into account the slowing of growth that results from cool weather and short days in fall, amounting to about 2 weeks)
= Days to Count Back from First Frost Date
The Optimum and Maximum Temperatures came from the page at this site that cites the data sources.
|Based on the average first frost date of 11/30/2019|
|Crop||Plant NLT **||Opt Soil Temp||Max Soil Temp|
|Brussels Sprouts (TP)***||8/2/2019|
|Cabbage, storage (TP)||8/7/2019||85||95|
|Cabbage, fresh eating (TP)||9/1/2019||85||95|
|Greens, Asian, full size (DS)||9/23/2019|
|Lettuce, heads (DS)||9/23/2019||75|
|Cabbage, Chinese (TP)||9/24/2019||85||95|
|Radish, Daikon (DS)||9/26/2019||85|
|Swiss chard, bunching (DS)||9/27/2019||85||95|
|Turnip, purple top (DS)||9/27/2019|
|Lettuce, baby (DS)||10/3/2019||75||85|
|Turnips, salad (DS)||10/8/2019|
|Radish, round (DS)||10/25/2019||80||95|
** The date calculated is the date to plant outdoors; crops that should be direct-sown are marked DS. Those marked TP should be set out as transplants on the date shown, so seeds should be started 4 weeks before the planting date.
*** Brussels sprouts should mature after frost, so no additional time is added for harvest period or fall factor.