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Vegetable Crop Calendars (A–C)Arugula Planting Calendar: Spring and Fall Windows
Arugula is fast and cool-loving, which makes timing a matter of avoiding heat and long days rather than hitting a single date.
Key points
- Sow arugula early in spring and again as summer heat fades.
- Bolting is driven by heat and lengthening days.
- Stagger small sowings instead of one large planting.
- Use row cover for flea beetles and for cold nights.
- Count from your own frost dates, not from a generic calendar.
When should you plant arugula in spring?
Arugula can be seeded as soon as the soil can be worked in spring. Light frost does not usually hurt the seedlings, and the plant grows quickest in cool weather. Your goal is to get a harvest in before the days lengthen and warm up, because those conditions send the plant to flower and turn the leaves sharp.
Work from your average last spring frost date. Many gardeners sow several weeks ahead of it, then keep sowing in small batches. Your state extension guide gives a specific lead time for your area, so check it instead of relying on a general rule.
Soil temperature is a better guide than the date on the calendar. A cheap probe thermometer pushed into the top inch of soil each morning shows when seed will move quickly. If the soil is cold and wet, waiting a few days costs you little, since arugula catches up fast once conditions improve.
How does day length change arugula?
Bolting in arugula responds to both heat and lengthening days. Once a seed stalk starts, leaves become bitter and tough, and the plant has finished its useful life. That is why a spring sowing made late can fail even if the weather feels mild.
Shorter autumn days work in your favor. A fall planting grows into cooler, shorter days and often holds longer in the garden than the spring one.
When is the fall window?
Count backward from your average first fall frost. Arugula matures quickly, so you can sow it late in summer and into early fall, and keep sowing until growth slows to a crawl in cold weather. The exact window depends on how quickly your fall cools down.
For example, if your first frost usually arrives in late October, you would look at the weeks before it for your sowings and use a floating cover to extend the harvest after. Those dates are an illustration only, so use your own local frost data from NOAA or your extension office.
- Find your average first fall frost date.
- Sow every one to two weeks in the early part of the window.
- Use a floating row cover when nights turn cold.
- Stop seeding when growth stalls and plan for the next season.
How do you set up succession sowings?
Because arugula is ready quickly, one large sowing wastes a lot of leaves. Sow a short row every week or so during the good windows, so you cut young leaves continuously. Cut when leaves are young and tender, and the plant often regrows for another harvest.
Water evenly. Dry stress adds to heat stress and pushes plants toward bitter leaves. Mulch lightly to keep the soil cool.
Keep a simple log with the sowing date, the first cutting and the day bolting began. After two or three seasons the log is more useful than any generic chart, because it reflects your own microclimate.
What soil conditions help arugula?
Arugula grows well in fertile, well-drained soil with a steady supply of moisture. A soil test will tell you whether you need lime or fertilizer, and your extension office can interpret the numbers for your garden. Fertilizer and nutrient rules vary by state, so follow local recommendations and avoid heavy applications close to harvest of leafy crops.
Plant seed shallow, and thin so leaves are not crowded.
Container growers can use the same schedule. A shallow tray or window box works well, and moving it into shade during a hot spell can buy extra weeks of harvest.
What goes wrong in arugula beds?
Flea beetles often chew small holes in the leaves of arugula and other brassicas, especially in spring. A floating row cover set at planting is a common non-chemical barrier. Ask your extension office what is active in your area, and use the label as your guide if you ever use a pesticide, including the pre-harvest interval and pollinator protections.
Other problems come from planting too late in spring or too early in fall, when the weather is still hot. Keep notes each year and shift your dates by a week or two.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.