Cumin · Bolingbrook, Illinois, United States
When to plant cumin in Bolingbrook
Main outdoor window
9-30 May
A climate estimate. Check your soil, forecast and cultivar.
Timed from last spring frost
25 April
In Bolingbrook, on your chosen risk.
Ready to pick
17 Aug - 16 Sep
If you plant at the start of the window.
The average last frost. Half of all years are later than this.
Step by step in Bolingbrook
Download these planting dates (.ics)
Import into Apple Calendar, Google Calendar or Outlook. Dates use the selected risk level and are planning estimates, not frost alerts.
Each window is a planning range. Check the forecast, soil and cultivar before planting; a later date is not automatically safer in hot or wet conditions.
Start indoors
14 Mar - 4 Apr
Six weeks before your last frost, under cover or on a windowsill.
Sow direct
9-30 May
Two weeks after your last frost.
Plant out
9-30 May
Two weeks after your last frost.
Harvest
17 Aug - 16 Sep
Cumin through the year
Against the frost risk in Bolingbrook
Seasonal context
Rainfall and the growing season in Bolingbrook
May has the highest average precipitation (119 mm); January has the lowest (48 mm). Compare this pattern with the planting windows and your water supply.
During wetter months, check that beds and containers drain after heavy rain. During drier months, plan how you will keep seeds and new transplants watered. Monthly averages can hide long dry spells and intense storms; they do not show soil moisture, humidity or this week's weather.
Source: NASA POWER, corrected MERRA-2 precipitation, 2001–2020. Values are approximate monthly totals, including the water equivalent of snow, from the nearest 0.5° × 0.625° grid cell. This reference period differs from the temperature record. Rainfall provides context and does not change the calculated planting dates. Method and limitations.
Monthly growing conditions in Bolingbrook
Compare the planting window with the local temperature pattern. These are historical monthly averages, not this year's forecast or measured soil temperatures. Average frost days do not tell you whether a particular night will freeze.
| Month | Average low | Average high | Frost days |
|---|---|---|---|
| January | -9.1°C (15.5°F)15.5°F (-9.1°C) | -0.6°C (31°F)31°F (-0.6°C) | 29.2 |
| February | -7.5°C (18.5°F)18.5°F (-7.5°C) | 2.3°C (36.1°F)36.1°F (2.3°C) | 26.3 |
| March | -2°C (28.5°F)28.5°F (-2°C) | 9.1°C (48.3°F)48.3°F (9.1°C) | 22.1 |
| April | 3.3°C (37.9°F)37.9°F (3.3°C) | 15.8°C (60.4°F)60.4°F (15.8°C) | 7.8 |
| May | 9.5°C (49.1°F)49.1°F (9.5°C) | 21.6°C (70.9°F)70.9°F (21.6°C) | 0.3 |
| June | 15.3°C (59.5°F)59.5°F (15.3°C) | 26.5°C (79.7°F)79.7°F (26.5°C) | 0.0 |
| July | 17.8°C (64°F)64°F (17.8°C) | 28.5°C (83.2°F)83.2°F (28.5°C) | 0.0 |
| August | 17.2°C (63°F)63°F (17.2°C) | 28.4°C (83.1°F)83.1°F (28.4°C) | 0.0 |
| September | 12.9°C (55.2°F)55.2°F (12.9°C) | 25.3°C (77.5°F)77.5°F (25.3°C) | 0.0 |
| October | 6.1°C (43°F)43°F (6.1°C) | 17.9°C (64.2°F)64.2°F (17.9°C) | 3.0 |
| November | -0.5°C (31°F)31°F (-0.5°C) | 9.4°C (48.9°F)48.9°F (9.4°C) | 17.6 |
| December | -5.9°C (21.4°F)21.4°F (-5.9°C) | 2.3°C (36.1°F)36.1°F (2.3°C) | 27.3 |
For cumin, also check drainage, sunlight and cultivar requirements. See the rainfall context above; humidity, irrigation and local pest pressure are not calculated.
Local growing check
Before choosing cumin for Bolingbrook
- May is the wettest month in the rainfall grid, averaging about 119 mm. Check how your own bed drains and plan watering around actual soil moisture; monthly rain totals are not an irrigation schedule.
The temperature and rainfall tables on this page show the underlying climate estimates. How these suitability checks work · Record what happens in your garden.
Before you plant cumin
Use the calendar to plan ahead, then check the conditions in your own garden.
- Measure the soil at sowing depth. Aim for at least 15°C (59°F); the calendar estimates soil warmth from air temperatures and cannot measure your bed.
- Check the local overnight forecast before planting out. Delay planting or keep protection ready if frost is forecast, even after the historical last-frost date.
- Harden off plants raised indoors: gradually expose them to outdoor light, wind and temperature before their final move into the bed.
- Use the maturity range on your seed packet when choosing a variety. Cold, short days and transplant stress can make harvest later than the calendar estimate.
Check that the season can finish a dry seed crop
Use a sunny, drained bed and avoid unnecessary root disturbance. Direct sowing can simplify establishment where the season is long enough; if starting under cover, handle the root ball gently when moving plants.
Collect stems when seed heads have browned and dried, then finish drying in a ventilated place over a container that catches falling seed. A few plants yield only a small quantity, making a trial patch useful before allocating a large bed.
What to record this season
Did seed heads dry before wet or cold weather, and was the yield worth the space? Add the cultivar, sowing date and conditions to your growing record so you can compare next season.
Further reading: NC State Extension: Cuminum cyminum . General crop guidance; local dates on this site are calculated separately. Source checked 19 September 2026 by Safe to Plant; this is not an expert review.
The reference describes plant identity and cultivation. Its regional calendar months and hardiness observations do not validate the calculated dates for another location.
How the dates are calculated and their limits · Keep a growing record · Report a local discrepancy
Why these dates
Use a sunny, drained bed and avoid unnecessary root disturbance. Direct sowing can simplify establishment where the season is long enough; if starting under cover, handle the root ball gently when moving plants.
Check the named variety and local forecast before exposing young growth. The catalog cold-damage figure is a reference, not a guarantee: plant age, acclimatisation, wind and the duration of a freeze affect damage.
This calendar uses frost-relative offsets as a starting point. Cumin are timed from 6 weeks before that frost for an indoor start, with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Bolingbrook.
The calendar also applies a soil-warming estimate derived from historical air temperatures. Where that estimate is later than the frost-based date, it delays the window. Soil in your own garden can warm earlier or later; a thermometer at sowing depth is a better final check. Cold, wet conditions can slow germination and increase decay risk.
The median frost-free season here is 180 days, against 100 to 130 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Growing cumin in Bolingbrook
Can I grow cumin in Bolingbrook?
The calendar estimates a planting window, not a guarantee of success. May is the wettest month in the rainfall grid, averaging about 119 mm. Check how your own bed drains and plan watering around actual soil moisture; monthly rain totals are not an irrigation schedule.
When should I plant cumin in Bolingbrook?
Aim for 9-30 May in an average year. If you would rather not gamble on the weather, wait until 19 May - 9 Jun - by then frost has finished in nine years out of ten.
When might cumin be ready to harvest in Bolingbrook?
The estimated period is 17 Aug - 16 Sep, based on 100 to 130 days from the modeled planting date. Cultivar, planting material and growing conditions can change this interval; check the plant as well as the calendar.
How much frost will cumin tolerate?
Check the named variety and local forecast before exposing young growth. The catalog cold-damage figure is a reference, not a guarantee: plant age, acclimatisation, wind and the duration of a freeze affect damage.