Zinnia · Palatine, Illinois, United States

When to plant zinnias in Palatine

Main outdoor window

14-28 Jun

A climate estimate. Check your soil, forecast and cultivar.

Timed from last spring frost

26 April

In Palatine, on your chosen risk.

First flowers

13 Aug - 2 Sep

If you plant at the start of the window.

The average last frost. Half of all years are later than this.

Estimated soil-warming check. The historical frost estimate is 3 May. An air-temperature model suggests soil suitable for zinnias may warm to about 21°C (69.8°F) around 14 June. This is a planning estimate, not a soil measurement. The calendar uses the later date; measure your bed at sowing depth and check the forecast before planting.

Step by step in Palatine

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

29 Mar - 12 Apr

Four weeks before your last frost, under cover or on a windowsill.

Sow direct

14-28 Jun

Delayed by a soil-warming estimate derived from historical air temperatures. The frost-only date would be 3 May. Measure your soil before planting.

Plant out

14-28 Jun

Delayed by a soil-warming estimate derived from historical air temperatures. The frost-only date would be 3 May. Measure your soil before planting.

In flower

13 Aug - 2 Sep

Sow in succession. A single sowing gives you a single glut. Sow a short row every 21 days through the window above and you get a steady supply instead.
Frost tolerance
Tender
Damaged below
0°C (32°F)
Days to flowering
60–80
Min soil temp
21°C (69.8°F)
Spacing
25 cm
Sowing depth
6 mm (0.2 in)
Sun
Full

Zinnias through the year

Against the frost risk in Palatine

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Zinnias

Frost risk Start indoors Sow direct Plant out Harvest Today
Open My Garden

Seasonal context

Rainfall and the growing season in Palatine

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.

Jan 44 mm
Feb 51 mm
Mar 63 mm
Apr 94 mm
May 121 mm
Jun 112 mm
Jul 100 mm
Aug 105 mm
Sep 87 mm
Oct 91 mm
Nov 58 mm
Dec 58 mm

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 Palatine

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.

NASA POWER climate averages, 1995–2024
MonthAverage lowAverage highFrost days
January -9.8°C (14.4°F) -1.5°C (29.3°F) 29.4
February -8.2°C (17.3°F) 1.1°C (33.9°F) 26.6
March -2.4°C (27.6°F) 7.7°C (45.9°F) 23.1
April 2.6°C (36.7°F) 14.5°C (58.1°F) 8.7
May 8.8°C (47.8°F) 20.7°C (69.3°F) 0.3
June 14.7°C (58.5°F) 26.3°C (79.3°F) 0.0
July 17.6°C (63.8°F) 28.7°C (83.6°F) 0.0
August 17.2°C (63°F) 28.3°C (83°F) 0.0
September 12.9°C (55.2°F) 24.7°C (76.4°F) 0.0
October 5.9°C (42.7°F) 17°C (62.6°F) 3.2
November -0.7°C (30.7°F) 8.4°C (47.2°F) 18.0
December -6.3°C (20.6°F) 1.4°C (34.5°F) 27.5

For zinnias, 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 zinnias for Palatine

  • 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 zinnias

Use the calendar to plan ahead, then check the conditions in your own garden.

  • Measure the soil at sowing depth. Aim for at least 21°C (69.8°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.

Warmth, sun and a variety that fits the space

Dwarf and tall varieties serve different purposes. Pick a compact type for a patio pot, or a taller variety if you want stems for cutting.

Allow the spacing recommended for the variety. In humid conditions, choose a disease-resistant type where available and leave enough room to inspect and tend the plants.

Treat the local calendar as a seasonal starting point. The flowering result will also depend on light, water and the length of the warm season after planting.

Growing in a container

Compact zinnias suit sunny containers with drainage; choose the variety by its mature height rather than the size of the nursery plant.

Further reading: RHS zinnia growing guide . General crop guidance; local dates on this site are calculated separately. Source checked 18 September 2026 by Safe to Plant; this is not an expert review.

How the dates are calculated and their limits · Keep a growing record · Report a local discrepancy

Why these dates

Dwarf and tall varieties serve different purposes. Pick a compact type for a patio pot, or a taller variety if you want stems for cutting.

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. Zinnias are timed from 4 weeks before that frost for an indoor start, with planting out 1 weeks after it, and this page simply resolves those offsets against the frost date computed for Palatine.

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 179 days, against 60 to 80 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.

See every crop timed for Palatine →

Nearby

Zinnias in places close by

Arlington Heights 5 km Hoffman Estates 8 km Mount Prospect 9 km Schaumburg 9 km Des Plaines 15 km Elgin 22 km

Also in Palatine

Other flowers to time

Tulips very hardy Daffodils very hardy Dahlias tender Sunflowers tender Crocuses very hardy Peonies very hardy Calendulas hardy Hyacinths very hardy Sweet peas hardy Pansies very hardy Snowdrops very hardy

Growing zinnias in Palatine

Can I grow zinnias in Palatine?

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 zinnias in Palatine?

Aim for 14-28 Jun in an average year. If you would rather not gamble on the weather, wait until 13-27 Jun - by then frost has finished in nine years out of ten.

Can I plant zinnias earlier in Palatine?

The historical frost estimate is 3 May. For Zinnias, an air-temperature model estimates soil warmth of about 21°C (69.8°F) around 14 Jun. This is not a soil measurement or a forecast. Check your bed at sowing depth; cold, wet conditions can slow growth and increase decay risk.

When might zinnias flower in Palatine?

The estimated period is 13 Aug - 2 Sep, based on 60 to 80 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 zinnias 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.