When to plant Daylily in DuPage County, IL
DuPage County's short 177-day growing season means one Daylily planting between May 7 and May 21. No fall crop in Zone 5b.
When to Plant Daylily in DuPage County, IL
Your July game plan for DuPage County, Illinois
Each item below is timed to DuPage County, Illinois's frost dates and soil temperatures. Skip nothing, stress about nothing.
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It's harvest week for daylily
If you can't use it all right away, check the food-preservation section of your planner.
Looking ahead to August
- First harvests: daylily
Hemerocallis (Daylily) is one of the most adaptable and trouble-free perennials in cultivation. Though each flower lasts only a single day, established clumps produce dozens to hundreds of buds per stem, delivering weeks of continuous color through summer. Modern hybrids extend the range from pale cream and melon through deep burgundy and purple. Nearly indestructible once established — tolerating poor soil, drought, competition, and neglect — daylilies form dense spreading clumps that effectively suppress weeds. An excellent low-maintenance choice for slopes, borders, and naturalized areas.
DuPage County, Illinois is in USDA Zone 5b. The average last spring frost is April 23 and the first fall frost is October 17, giving you a growing season of approximately 177 days.
At an elevation of 803 feet, DuPage County receives approximately 31 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83°F, so choose short-season varieties of Daylily to ensure they mature before fall.
DuPage County Soil Profile
Soil Type
Silt Loam
Soil pH
6-6.7
Drainage
Well Drained
Daylily Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in DuPage County
How your county's soil matches Daylily's growing requirements.
Soil pH
Your soil pH (6.0–6.7) is within Daylily's preferred range (6.0–7.0).
Soil Texture
The silt loam soil in DuPage County is excellent for Daylily — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (5.0%) — Daylily will thrive.
How to Plant Daylily
Succession Planting Daylily
Sow every 6.9 weeks. Last sowing by Jul 19 to harvest before frost.
Daylily Water Budget
Monthly Watering Guide for Daylily
Daylily needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Daylily Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.5" | 0" | ❄️ Dormant |
| Mar | — | 1.9" | 0" | ❄️ Dormant |
| Apr | 2.2" | 3" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.7" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 4.3" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 2.9" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 3.7" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 2.6" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.2" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.3" | 0" | ❄️ Dormant |
| Dec | — | 1.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in DuPage County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Daylily Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Daylily Planting Timeline — DuPage County, IL
Daylily Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 19 | Feb 19 – Mar 5 |
| Transplant Outdoors | May 7 | May 7 – May 21 |
| Bloom | July 30 | Jul 30 – Oct 29 |
Plant 1" deep · 24" apart · Rows 30" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | Start Indoors |
| April | — |
| May | Transplant Outdoors |
| June | — |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: ideal
🗺️ USDA Zone
Zone 5b
📆 Growing Season
177 days in DuPage County
Growing Tips for Daylily in DuPage County
Direct sow Daylily outdoors after April 23 in DuPage County when soil has warmed and frost danger has passed.
General growing tips
Daylilies are most commonly propagated by division rather than seed; cultivar seeds do not come true. Transplant bare-root or potted divisions in early spring or fall, setting crowns no more than 1 inch below soil level. If starting from seed (species types only), start indoors 8–10 weeks before last frost. Established plants are extremely drought-tolerant; moderate water during bloom period improves flower quality. Divide crowded clumps every 3–5 years in early spring or fall to maintain vigor. In warm zones (8+), some cultivars are evergreen; in cold zones, foliage dies back each fall. Year 2+ plants bloom most heavily — first-year transplants may produce limited flowers.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Daylily in Other Locations
Frequently Asked Questions
When should I plant Daylily in DuPage County, IL?
DuPage County is in Zone 5b with an average last frost of April 23. Plan your Daylily planting based on this frost date — see the calendar above for exact timing.
What planting zone is DuPage County, IL?
DuPage County, Illinois is in USDA Hardiness Zone 5b. The average last spring frost is April 23 and first fall frost is October 17.
When should I plant Daylily in DuPage County, IL?
In DuPage County, IL, plant Daylily after the last frost (around April 23) and before the first frost (around October 17). Best results when soil holds above 50°F.
What growing zone is DuPage County, IL for Daylily?
DuPage County sits in USDA Zone 5b. Daylily grows reliably in zones 3a through 10b, so it's a good fit here.
Can Daylily grow in DuPage County's climate?
Yes — Daylily grows well in DuPage County's temperate climate. DuPage County averages a 177-day frost-free season, with last frost around April 23 and first frost around October 17.
Your DuPage County Garden Planner — Free
A 22-page printable planner built for DuPage County (Zone 5b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.