Persian buttercup · Hoffman Estates, Illinois, United States
When to plant persian buttercups in Hoffman Estates
Main outdoor window
10-24 Sep
A climate estimate. Check your soil, forecast and cultivar.
Timed from last spring frost
26 April
In Hoffman Estates, on your chosen risk.
First flowers
1 Apr - 30 Jun
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 Hoffman Estates
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 corms
10-24 Sep
Four to six weeks before your first frost, so roots form before the ground cools.
In flower
1 Apr - 30 Jun
Persian buttercups through the year
Against the frost risk in Hoffman Estates
Seasonal context
Rainfall and the growing season in Hoffman Estates
May has the highest average precipitation (121 mm); January has the lowest (44 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 Hoffman Estates
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 | -9.8°C (14.4°F)14.4°F (-9.8°C) | -1.5°C (29.3°F)29.3°F (-1.5°C) | 29.4 |
| February | -8.2°C (17.3°F)17.3°F (-8.2°C) | 1.1°C (33.9°F)33.9°F (1.1°C) | 26.6 |
| March | -2.4°C (27.6°F)27.6°F (-2.4°C) | 7.7°C (45.9°F)45.9°F (7.7°C) | 23.1 |
| April | 2.6°C (36.7°F)36.7°F (2.6°C) | 14.5°C (58.1°F)58.1°F (14.5°C) | 8.7 |
| May | 8.8°C (47.8°F)47.8°F (8.8°C) | 20.7°C (69.3°F)69.3°F (20.7°C) | 0.3 |
| June | 14.7°C (58.5°F)58.5°F (14.7°C) | 26.3°C (79.3°F)79.3°F (26.3°C) | 0.0 |
| July | 17.6°C (63.8°F)63.8°F (17.6°C) | 28.7°C (83.6°F)83.6°F (28.7°C) | 0.0 |
| August | 17.2°C (63°F)63°F (17.2°C) | 28.3°C (83°F)83°F (28.3°C) | 0.0 |
| September | 12.9°C (55.2°F)55.2°F (12.9°C) | 24.7°C (76.4°F)76.4°F (24.7°C) | 0.0 |
| October | 5.9°C (42.7°F)42.7°F (5.9°C) | 17°C (62.6°F)62.6°F (17°C) | 3.2 |
| November | -0.7°C (30.7°F)30.7°F (-0.7°C) | 8.4°C (47.2°F)47.2°F (8.4°C) | 18.0 |
| December | -6.3°C (20.6°F)20.6°F (-6.3°C) | 1.4°C (34.5°F)34.5°F (1.4°C) | 27.5 |
For persian buttercups, 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 persian buttercups for Hoffman Estates
- May is the wettest month in the rainfall grid, averaging about 121 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 persian buttercups
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.
- 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.
Match ranunculus to cool growth and a dry dormant phase
Plant sound material with the claws downward, following supplier depth and preparation guidance. Provide sun and excellent drainage; heavy wet soil can cause rot before a useful flowering plant develops.
Remove spent flowers and let foliage complete its cycle. As plants become dormant, adjust watering rather than keeping inactive roots constantly wet. Where storage is necessary, lift and retain only sound material under suitable cool, dry conditions.
What to record this season
Did plants flower before heat triggered decline, and did stored roots remain sound? Add the cultivar, sowing date and conditions to your growing record so you can compare next season.
Further reading: NC State Extension: Ranunculus asiaticus . 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
Plant sound material with the claws downward, following supplier depth and preparation guidance. Provide sun and excellent drainage; heavy wet soil can cause rot before a useful flowering plant develops.
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.
Persian buttercups are anchored to the first autumn frost rather than the last spring one, so the planting window on this page counts backwards from the end of the season in Hoffman Estates instead of forwards from its start.
Hoffman Estates 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 median frost-free season here is 179 days, against 90 to 120 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Nearby
Persian buttercups in places close by
Also in Hoffman Estates
Other flowers to time
Growing persian buttercups in Hoffman Estates
Can I grow persian buttercups in Hoffman Estates?
The calendar estimates a planting window, not a guarantee of success. May is the wettest month in the rainfall grid, averaging about 121 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 persian buttercups in Hoffman Estates?
Aim for 10-24 Sep in an average year. If you would rather not gamble on the weather, wait until 27 Aug - 10 Sep - by then frost has finished in nine years out of ten.
When might persian buttercups flower in Hoffman Estates?
The estimated period is 1 Apr - 30 Jun, based on 90 to 120 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 persian buttercups 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.