Olive · Bolingbrook, Illinois, United States
When to plant olives in Bolingbrook
Main outdoor window
2-30 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
1 Oct - 31 Dec
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.
Plant the tree
2-30 May
After the last frost, once the soil has warmed. This crop is never fully dormant, so it cannot be planted bare-root in winter.
Harvest
1 Oct - 31 Dec
Olives 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 olives, 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 olives 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 olives
Use the calendar to plan ahead, then check the conditions in your own garden.
- 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.
- Check the cultivar’s winter chill requirement with a local nursery. Hardiness zones measure winter cold, not chill hours; this site does not calculate a local chill-hour total.
- Check mature size, drainage and cultivar suitability before choosing a permanent position. A suitable planting window does not guarantee long-term survival or fruiting.
Choose a fruiting olive and check the whole seasonal cycle
Olives suit strong light, sharp drainage and an appropriate seasonal cycle, typically including warm dry summers. A tree remaining evergreen in a pot is not evidence that it receives the conditions needed for flowering and fruit development.
Allow for eventual size and remove damaged growth while maintaining access for picking. Fresh olives require suitable processing before eating; decide whether you actually want to manage a crop as well as a tree. Check local invasive-plant guidance where olives readily naturalise.
What to record this season
Did the tree flower and set fruit, and was the crop practical to harvest and process? Add the cultivar, sowing date and conditions to your growing record so you can compare next season.
Further reading: NC State Extension: Olea europaea . 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
Olives suit strong light, sharp drainage and an appropriate seasonal cycle, typically including warm dry summers. A tree remaining evergreen in a pot is not evidence that it receives the conditions needed for flowering and fruit development.
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.
Olives are planted once and then left in place, so there is no sowing offset to resolve. Nor is there a dormant season to plant into: this crop keeps its leaves and keeps growing through the winter, which is exactly why cold damages it. The window on this page therefore waits until the last frost in Bolingbrook has passed and the soil has begun to warm, giving the roots the longest possible run before the cold returns.
Bolingbrook sits in zone 5b, which is colder than the catalog range. Check a locally proven cultivar and a realistic protection plan before planting. The calculated dates do not confirm that this crop is suitable here. Check cultivar requirements and local growing experience before planting.
The general establishment guide is around year 4, under suitable conditions. This is not a prediction for this location; cultivar, winter conditions and care determine whether it crops reliably.
Also in Bolingbrook
Other fruits to time
Growing olives in Bolingbrook
Can I grow olives 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 olives in Bolingbrook?
Aim for 2-30 May in an average year. If you would rather not gamble on the weather, wait until 12 May - 9 Jun - by then frost has finished in nine years out of ten.
When might olives be ready to harvest in Bolingbrook?
The estimated period is 1 Oct - 31 Dec, based on 180 to 220 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 olives 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.