Ferguson, IA frost dates
Last spring frostApr 28median date
First fall frostOct 7median date
Growing season162 daysfrost-free
Hardiness zone5aZone 5a
How Ferguson compares
- In 8 years out of 10, the last spring frost in Ferguson falls between April 13 and May 11, a 28-day window. The first fall frost falls between September 22 and October 21.
- The median last frost is the same as the Iowa median of Apr 28.
- Its 162-day growing season is longer than 31% of the 934 Iowa places with a regular frost season (state median 165 days).
- The last frost is 5 days earlier than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 152 nights a year at or below 32°F.
- Compared with Ames, IA, 63 km away, the last frost here is 2 days later than there and the growing season is 3 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 13 |
| 50% (median) | April 28 |
| 10% (safe for tender plants) | May 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 22 |
| 50% (median) | October 7 |
| 90% (late) | October 21 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Ferguson, IA
Ferguson, IA frost dates — last frost Apr 28, first frost Oct 7, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 31 to Apr 14
Start indoors: Feb 17 to Mar 3Transplant outside: May 12 to May 26
Start indoors: Feb 17 to Mar 3Transplant outside: May 12 to May 26
Start indoors: Mar 3 to Mar 17Transplant outside: May 5 to May 19
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 7 to Apr 21Sow outdoors: Mar 31 to May 5Plant for fall: Aug 12 to Sep 9
Start indoors: Mar 3 to Mar 17Transplant outside: Mar 31 to Apr 14Sow outdoors: Mar 31 to Apr 14Plant for fall: Jul 29 to Aug 19
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 14 to Apr 28Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 7 to Apr 21Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 14 to Apr 28Plant for fall: Jul 1 to Jul 22
Start indoors: Mar 17 to Mar 31Transplant outside: May 19 to Jun 2Sow outdoors: May 19 to Jun 2
Start indoors: Mar 17 to Mar 31Transplant outside: May 5 to May 19
Sow outdoors: Mar 17 to Apr 7Plant for fall: Jul 15 to Aug 5
Sow outdoors: Mar 17 to Apr 7Plant for fall: Aug 12 to Sep 2
Sow outdoors: Mar 24 to May 5Plant for fall: Aug 26 to Sep 16
Start indoors: Mar 31 to Apr 7Transplant outside: May 12 to May 19Sow outdoors: May 5 to May 19Plant for fall: Jul 22 to Aug 5
Start indoors: Mar 31 to Apr 7Sow outdoors: May 5 to May 19Plant for fall: Jul 29 to Aug 12
Start indoors: Mar 31 to Apr 7Sow outdoors: May 5 to May 19
Start indoors: Mar 31 to Apr 7Transplant outside: May 12 to May 26
Sow outdoors: Apr 7 to May 5Plant for fall: Jul 15 to Jul 29
Sow outdoors: Apr 7 to May 5Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 7 to Apr 28
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 14 to May 5Plant for fall: Aug 12 to Sep 2
Sow outdoors: May 5 to May 26Plant for fall: Jul 22 to Aug 5
Sow outdoors: May 5 to May 19
Transplant outside: May 12 to Jun 2
Plant for fall: Sep 23 to Oct 28
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Ferguson, IA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 3 – Feb 17 | Mar 31 – Apr 14 | — | — |
| Peppers | Feb 17 – Mar 3 | May 12 – May 26 | — | — |
| Eggplant | Feb 17 – Mar 3 | May 12 – May 26 | — | — |
| Tomatoes | Mar 3 – Mar 17 | May 5 – May 19 | — | — |
| Lettuce | Mar 3 – Mar 17 | Apr 7 – Apr 21 | Mar 31 – May 5 | Aug 12 – Sep 9 |
| Kale | Mar 3 – Mar 17 | Mar 31 – Apr 14 | Mar 31 – Apr 14 | Jul 29 – Aug 19 |
| Broccoli | Mar 3 – Mar 17 | Apr 14 – Apr 28 | — | Jul 1 – Jul 22 |
| Cabbage | Mar 3 – Mar 17 | Apr 7 – Apr 21 | — | Jul 1 – Jul 22 |
| Cauliflower | Mar 3 – Mar 17 | Apr 14 – Apr 28 | — | Jul 1 – Jul 22 |
| Okra | Mar 17 – Mar 31 | May 19 – Jun 2 | May 19 – Jun 2 | — |
| Basil | Mar 17 – Mar 31 | May 5 – May 19 | — | — |
| Peas | — | — | Mar 17 – Apr 7 | Jul 15 – Aug 5 |
| Spinach | — | — | Mar 17 – Apr 7 | Aug 12 – Sep 2 |
| Radishes | — | — | Mar 24 – May 5 | Aug 26 – Sep 16 |
| Cucumbers | Mar 31 – Apr 7 | May 12 – May 19 | May 5 – May 19 | Jul 22 – Aug 5 |
| Zucchini & Summer Squash | Mar 31 – Apr 7 | — | May 5 – May 19 | Jul 29 – Aug 12 |
| Winter Squash & Pumpkins | Mar 31 – Apr 7 | — | May 5 – May 19 | — |
| Melons & Watermelon | Mar 31 – Apr 7 | May 12 – May 26 | — | — |
| Carrots | — | — | Apr 7 – May 5 | Jul 15 – Jul 29 |
| Beets | — | — | Apr 7 – May 5 | Jul 29 – Aug 12 |
| Potatoes | — | — | Apr 7 – Apr 28 | — |
| Swiss Chard | — | — | Apr 14 – May 12 | Jul 29 – Aug 12 |
| Cilantro | — | — | Apr 14 – May 5 | Aug 12 – Sep 2 |
| Green Beans | — | — | May 5 – May 26 | Jul 22 – Aug 5 |
| Sweet Corn | — | — | May 5 – May 19 | — |
| Sweet Potatoes | — | May 12 – Jun 2 | — | — |
| Garlic | — | — | — | Sep 23 – Oct 28 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Marshalltown, IA weather station, 15 km away (elevation 869 ft (265 m)).
Frost dates near Ferguson
- Gilman Apr 28 · Oct 7
- Laurel Apr 28 · Oct 7
- Haverhill Apr 28 · Oct 7
- Le Grand Apr 28 · Oct 7
- Marshalltown Apr 28 · Oct 7
- Montour Apr 30 · Oct 9
- Melbourne Apr 28 · Oct 7
- Garwin Apr 30 · Oct 9
- Albion Apr 30 · Oct 6
- Tama Apr 30 · Oct 9
Frequently asked questions
When is the last frost in Ferguson, IA?
The median last spring frost in Ferguson, IA is April 28. There is still about a 10% chance of frost after May 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Ferguson, IA?
The median first fall frost is October 7, with about a 10% chance of frost before September 22.
How long is the growing season in Ferguson, IA?
About 162 days between the median last spring frost and first fall frost.
What planting zone is Ferguson, IA?
Ferguson, IA is in USDA hardiness zone 5a.