Most gardeners should plant turnips month ranges of March through April for spring or August through September for fall. These windows give turnips the cool temps they crave for sweet, tender roots. Planting outside these months often leads to bolting or bitter flavor. Get the timing right and turnips become one of the easiest crops in your garden.
Figuring out when to plant turnips in your own yard takes a bit of local knowledge and some trial runs. I've tested both spring and fall windows for six years running in my zone 6 garden. My fall crops win every time with sweeter and less woody roots than the spring batches. Cool nights and short days push the plants to store sugars in their roots rather than their tops. The spring turnips grow fine but lack that same depth of flavor I get from an autumn harvest. Fall just brings out the best in this crop no matter what variety I put in the ground.
Temperature drives the timing more than the calendar date itself. Turnips need soil temps of at least 50°F (10°C) for seeds to sprout well. The ideal air temp range sits between 40-75°F (4-24°C) for strong growth. Once heat climbs above 75°F, roots get tough and the plant rushes to flower. Hot weather is the top reason turnips fail in home gardens. A cheap soil thermometer takes the guesswork out of this step and costs under ten dollars at any garden center.
Your turnip planting calendar shifts based on your region and local climate patterns. Northern states like Minnesota aim for March to April and August to September. Southern growers in Texas or Georgia can start in February or March for spring. Their fall window runs from September to October instead. Florida gardeners have the widest range from August through February per UF/IFAS data. That mild winter climate lets them grow turnips for almost half the year without any frost cover.
I stick my soil thermometer about 3 inches down each morning for a few days before sowing any seeds. Once it reads above 50°F three mornings in a row, I plant with full confidence that the seeds will pop up fast. This simple habit has saved me from wasting seeds on cold soil more times than I can count. The ground can look warm and feel ready but still be too cold just below the surface for good sprouting. Don't trust your hand. Trust the thermometer reading instead.
For a steady harvest, try sowing new rows every 10 days during your planting window. UIUC Extension suggests this method for spreading out your crop over weeks. You pull young roots from the first batch while later ones still grow underground. This keeps fresh turnips coming to the table for a solid month or more. One big planting gives you too many turnips at once and then nothing for the rest of the season. Staggered sowing fixes that problem.
Spring turnip planting works great for quick greens and baby roots if you harvest them young. For the best tasting roots, though, fall is the clear winner every single year. A light frost turns starches into natural sugars right inside the root. My October and November harvests taste far better than anything pulled in May. Count back 45-60 days from your first frost date to find the right fall sowing day. This gives your turnips enough time to size up before the ground freezes hard for winter.
Read the full article: Growing Turnips: A Step-by-Step Plan
