Arbon, ID frost dates
Last spring frostMay 23median date
First fall frostSep 24median date
Growing season124 daysfrost-free
Hardiness zone6aZone 6a
How Arbon compares
- In 8 years out of 10, the last spring frost in Arbon falls between May 6 and June 10, a 35-day window. The first fall frost falls between September 7 and October 7.
- The median last frost is 9 days later than the Idaho median of May 14.
- Its 124-day growing season is longer than 27% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 24 days later than the zone 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 179 nights a year at or below 32°F.
- Compared with Pocatello, ID, 38 km away, the last frost here is 21 days later than there and the growing season is 38 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 6 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 10 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 7 |
| 50% (median) | September 24 |
| 90% (late) | October 7 |
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 Arbon, ID
Arbon, ID frost dates — last frost May 23, first frost Sep 24, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 28 to Mar 14Transplant outside: Apr 25 to May 9
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Sow outdoors: Apr 25 to May 30Plant for fall: Jul 30 to Aug 27
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 18 to Jul 9
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 2 to Jul 23
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 30 to Aug 20
Sow outdoors: Apr 18 to May 30Plant for fall: Aug 13 to Sep 3
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13Plant for fall: Jul 9 to Jul 23
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: May 2 to May 30Plant for fall: Jul 2 to Jul 16
Sow outdoors: May 2 to May 30Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 9 to May 30Plant for fall: Jul 30 to Aug 20
Sow outdoors: May 30 to Jun 20Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Sep 10 to Oct 15
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Arbon, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 28 – Mar 14 | Apr 25 – May 9 | — | — |
| Peppers | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Eggplant | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Tomatoes | Mar 28 – Apr 11 | May 30 – Jun 13 | — | — |
| Lettuce | Mar 28 – Apr 11 | May 2 – May 16 | Apr 25 – May 30 | Jul 30 – Aug 27 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 16 – Aug 6 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 18 – Jul 9 |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | Jun 18 – Jul 9 |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 18 – Jul 9 |
| Okra | Apr 11 – Apr 25 | Jun 13 – Jun 27 | Jun 13 – Jun 27 | — |
| Basil | Apr 11 – Apr 25 | May 30 – Jun 13 | — | — |
| Peas | — | — | Apr 11 – May 2 | Jul 2 – Jul 23 |
| Spinach | — | — | Apr 11 – May 2 | Jul 30 – Aug 20 |
| Radishes | — | — | Apr 18 – May 30 | Aug 13 – Sep 3 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | Jul 9 – Jul 23 |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 16 – Jul 30 |
| Winter Squash & Pumpkins | Apr 25 – May 2 | — | May 30 – Jun 13 | — |
| Melons & Watermelon | Apr 25 – May 2 | Jun 6 – Jun 20 | — | — |
| Carrots | — | — | May 2 – May 30 | Jul 2 – Jul 16 |
| Beets | — | — | May 2 – May 30 | Jul 16 – Jul 30 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 16 – Jul 30 |
| Cilantro | — | — | May 9 – May 30 | Jul 30 – Aug 20 |
| Green Beans | — | — | May 30 – Jun 20 | Jul 9 – Jul 23 |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Sep 10 – Oct 15 |
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 Mccammon, ID weather station, 34 km away (elevation 4,770 ft (1,454 m)).
Frost dates near Arbon
- Rockland May 20 · Sep 26
- Arimo May 23 · Sep 24
- McCammon May 23 · Sep 24
- American Falls May 20 · Sep 26
- Downey May 31 · Sep 18
- Pocatello May 2 · Oct 11
- Holbrook May 22 · Sep 20
- Inkom May 23 · Sep 24
- Malad City May 22 · Sep 20
- Lava Hot Springs May 21 · Sep 21
Frequently asked questions
When is the last frost in Arbon, ID?
The median last spring frost in Arbon, ID is May 23. There is still about a 10% chance of frost after June 10, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Arbon, ID?
The median first fall frost is September 24, with about a 10% chance of frost before September 7.
How long is the growing season in Arbon, ID?
About 124 days between the median last spring frost and first fall frost.
What planting zone is Arbon, ID?
Arbon, ID is in USDA hardiness zone 6a.