Highlandville, IA frost dates
Last spring frostMay 10median date
First fall frostSep 28median date
Growing season141 daysfrost-free
Hardiness zone5aZone 5a
How Highlandville compares
- In 8 years out of 10, the last spring frost in Highlandville falls between April 27 and May 23, a 26-day window. The first fall frost falls between September 14 and October 10.
- The median last frost is 12 days later than the Iowa median of Apr 28.
- Its 141-day growing season is among the shortest of the 934 Iowa places with a regular frost season.
- The last frost is 7 days later 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 176 nights a year at or below 32°F.
- Compared with La Crosse, WI, 58 km away, the last frost here is 13 days later than there and the growing season is 28 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 27 |
| 50% (median) | May 10 |
| 10% (safe for tender plants) | May 23 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 14 |
| 50% (median) | September 28 |
| 90% (late) | October 10 |
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 Highlandville, IA
Highlandville, IA frost dates — last frost May 10, first frost Sep 28, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Feb 15 to Mar 1Transplant outside: Apr 12 to Apr 26
Start indoors: Mar 1 to Mar 15Transplant outside: May 24 to Jun 7
Start indoors: Mar 1 to Mar 15Transplant outside: May 24 to Jun 7
Start indoors: Mar 15 to Mar 29Transplant outside: May 17 to May 31
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 19 to May 3Sow outdoors: Apr 12 to May 17Plant for fall: Aug 3 to Aug 31
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 12 to Apr 26Sow outdoors: Apr 12 to Apr 26Plant for fall: Jul 20 to Aug 10
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 26 to May 10Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 19 to May 3Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 15 to Mar 29Transplant outside: Apr 26 to May 10Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 29 to Apr 12Transplant outside: May 31 to Jun 14Sow outdoors: May 31 to Jun 14
Start indoors: Mar 29 to Apr 12Transplant outside: May 17 to May 31
Sow outdoors: Mar 29 to Apr 19Plant for fall: Jul 6 to Jul 27
Sow outdoors: Mar 29 to Apr 19Plant for fall: Aug 3 to Aug 24
Sow outdoors: Apr 5 to May 17Plant for fall: Aug 17 to Sep 7
Start indoors: Apr 12 to Apr 19Transplant outside: May 24 to May 31Sow outdoors: May 17 to May 31Plant for fall: Jul 13 to Jul 27
Start indoors: Apr 12 to Apr 19Sow outdoors: May 17 to May 31Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 12 to Apr 19Sow outdoors: May 17 to May 31
Start indoors: Apr 12 to Apr 19Transplant outside: May 24 to Jun 7
Sow outdoors: Apr 19 to May 17Plant for fall: Jul 6 to Jul 20
Sow outdoors: Apr 19 to May 17Plant for fall: Jul 20 to Aug 3
Sow outdoors: Apr 19 to May 10
Sow outdoors: Apr 26 to May 24Plant for fall: Jul 20 to Aug 3
Sow outdoors: Apr 26 to May 17Plant for fall: Aug 3 to Aug 24
Sow outdoors: May 17 to Jun 7Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 17 to May 31
Transplant outside: May 24 to Jun 14
Plant for fall: Sep 14 to Oct 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Highlandville, IA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 15 – Mar 1 | Apr 12 – Apr 26 | — | — |
| Peppers | Mar 1 – Mar 15 | May 24 – Jun 7 | — | — |
| Eggplant | Mar 1 – Mar 15 | May 24 – Jun 7 | — | — |
| Tomatoes | Mar 15 – Mar 29 | May 17 – May 31 | — | — |
| Lettuce | Mar 15 – Mar 29 | Apr 19 – May 3 | Apr 12 – May 17 | Aug 3 – Aug 31 |
| Kale | Mar 15 – Mar 29 | Apr 12 – Apr 26 | Apr 12 – Apr 26 | Jul 20 – Aug 10 |
| Broccoli | Mar 15 – Mar 29 | Apr 26 – May 10 | — | Jun 22 – Jul 13 |
| Cabbage | Mar 15 – Mar 29 | Apr 19 – May 3 | — | Jun 22 – Jul 13 |
| Cauliflower | Mar 15 – Mar 29 | Apr 26 – May 10 | — | Jun 22 – Jul 13 |
| Okra | Mar 29 – Apr 12 | May 31 – Jun 14 | May 31 – Jun 14 | — |
| Basil | Mar 29 – Apr 12 | May 17 – May 31 | — | — |
| Peas | — | — | Mar 29 – Apr 19 | Jul 6 – Jul 27 |
| Spinach | — | — | Mar 29 – Apr 19 | Aug 3 – Aug 24 |
| Radishes | — | — | Apr 5 – May 17 | Aug 17 – Sep 7 |
| Cucumbers | Apr 12 – Apr 19 | May 24 – May 31 | May 17 – May 31 | Jul 13 – Jul 27 |
| Zucchini & Summer Squash | Apr 12 – Apr 19 | — | May 17 – May 31 | Jul 20 – Aug 3 |
| Winter Squash & Pumpkins | Apr 12 – Apr 19 | — | May 17 – May 31 | — |
| Melons & Watermelon | Apr 12 – Apr 19 | May 24 – Jun 7 | — | — |
| Carrots | — | — | Apr 19 – May 17 | Jul 6 – Jul 20 |
| Beets | — | — | Apr 19 – May 17 | Jul 20 – Aug 3 |
| Potatoes | — | — | Apr 19 – May 10 | — |
| Swiss Chard | — | — | Apr 26 – May 24 | Jul 20 – Aug 3 |
| Cilantro | — | — | Apr 26 – May 17 | Aug 3 – Aug 24 |
| Green Beans | — | — | May 17 – Jun 7 | Jul 13 – Jul 27 |
| Sweet Corn | — | — | May 17 – May 31 | — |
| Sweet Potatoes | — | May 24 – Jun 14 | — | — |
| Garlic | — | — | — | Sep 14 – Oct 19 |
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 Mabel, MN weather station, 9 km away (elevation 1,112 ft (339 m)).
Frost dates near Highlandville
- Dorchester May 2 · Oct 11
- Decorah May 3 · Oct 7
- Waukon May 2 · Oct 11
- Ridgeway May 8 · Oct 1
- New Albin Apr 22 · Oct 17
- Calmar May 3 · Oct 7
- Spillville May 3 · Oct 7
- Lansing May 2 · Oct 11
- Castalia May 1 · Oct 3
- Ossian May 1 · Oct 3
Frequently asked questions
When is the last frost in Highlandville, IA?
The median last spring frost in Highlandville, IA is May 10. There is still about a 10% chance of frost after May 23, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Highlandville, IA?
The median first fall frost is September 28, with about a 10% chance of frost before September 14.
How long is the growing season in Highlandville, IA?
About 141 days between the median last spring frost and first fall frost.
What planting zone is Highlandville, IA?
Highlandville, IA is in USDA hardiness zone 5a.