Hamer, ID frost dates
Last spring frostJun 3median date
First fall frostSep 11median date
Growing season100 daysfrost-free
Hardiness zone5aZone 5a
How Hamer compares
- In 8 years out of 10, the last spring frost in Hamer falls between May 15 and June 21, a 37-day window. The first fall frost falls between August 30 and September 24.
- The median last frost is 20 days later than the Idaho median of May 14.
- Its 100-day growing season is longer than 11% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 31 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 205 nights a year at or below 32°F.
- Compared with Idaho Falls, ID, 52 km away, the last frost here is 25 days later than there and the growing season is 45 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 15 |
| 50% (median) | June 3 |
| 10% (safe for tender plants) | June 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 30 |
| 50% (median) | September 11 |
| 90% (late) | September 24 |
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 Hamer, ID
Hamer, ID frost dates — last frost Jun 3, first frost Sep 11, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 11 to Mar 25Transplant outside: May 6 to May 20
Start indoors: Mar 25 to Apr 8Transplant outside: Jun 17 to Jul 1
Start indoors: Mar 25 to Apr 8Transplant outside: Jun 17 to Jul 1
Start indoors: Apr 8 to Apr 22Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 13 to May 27Sow outdoors: May 6 to Jun 10Plant for fall: Jul 17 to Aug 14
Start indoors: Apr 8 to Apr 22Transplant outside: May 6 to May 20Sow outdoors: May 6 to May 20Plant for fall: Jul 3 to Jul 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 20 to Jun 3
Start indoors: Apr 8 to Apr 22Transplant outside: May 13 to May 27
Start indoors: Apr 8 to Apr 22Transplant outside: May 20 to Jun 3
Start indoors: Apr 22 to May 6Transplant outside: Jun 24 to Jul 8Sow outdoors: Jun 24 to Jul 8
Start indoors: Apr 22 to May 6Transplant outside: Jun 10 to Jun 24
Sow outdoors: Apr 22 to May 13Plant for fall: Jun 19 to Jul 10
Sow outdoors: Apr 22 to May 13Plant for fall: Jul 17 to Aug 7
Sow outdoors: Apr 29 to Jun 10Plant for fall: Jul 31 to Aug 21
Start indoors: May 6 to May 13Transplant outside: Jun 17 to Jun 24Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Transplant outside: Jun 17 to Jul 1
Sow outdoors: May 13 to Jun 10
Sow outdoors: May 13 to Jun 10Plant for fall: Jul 3 to Jul 17
Sow outdoors: May 13 to Jun 3
Sow outdoors: May 20 to Jun 17Plant for fall: Jul 3 to Jul 17
Sow outdoors: May 20 to Jun 10Plant for fall: Jul 17 to Aug 7
Sow outdoors: Jun 10 to Jul 1
Sow outdoors: Jun 10 to Jun 24
Transplant outside: Jun 17 to Jul 8
Plant for fall: Aug 28 to Oct 2
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Hamer, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 11 – Mar 25 | May 6 – May 20 | — | — |
| Peppers | Mar 25 – Apr 8 | Jun 17 – Jul 1 | — | — |
| Eggplant | Mar 25 – Apr 8 | Jun 17 – Jul 1 | — | — |
| Tomatoes | Apr 8 – Apr 22 | Jun 10 – Jun 24 | — | — |
| Lettuce | Apr 8 – Apr 22 | May 13 – May 27 | May 6 – Jun 10 | Jul 17 – Aug 14 |
| Kale | Apr 8 – Apr 22 | May 6 – May 20 | May 6 – May 20 | Jul 3 – Jul 24 |
| Broccoli | Apr 8 – Apr 22 | May 20 – Jun 3 | — | — |
| Cabbage | Apr 8 – Apr 22 | May 13 – May 27 | — | — |
| Cauliflower | Apr 8 – Apr 22 | May 20 – Jun 3 | — | — |
| Okra | Apr 22 – May 6 | Jun 24 – Jul 8 | Jun 24 – Jul 8 | — |
| Basil | Apr 22 – May 6 | Jun 10 – Jun 24 | — | — |
| Peas | — | — | Apr 22 – May 13 | Jun 19 – Jul 10 |
| Spinach | — | — | Apr 22 – May 13 | Jul 17 – Aug 7 |
| Radishes | — | — | Apr 29 – Jun 10 | Jul 31 – Aug 21 |
| Cucumbers | May 6 – May 13 | Jun 17 – Jun 24 | Jun 10 – Jun 24 | — |
| Zucchini & Summer Squash | May 6 – May 13 | — | Jun 10 – Jun 24 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 100 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 6 – May 13 | — | Jun 10 – Jun 24 | — |
| Melons & Watermelon | May 6 – May 13 | Jun 17 – Jul 1 | — | — |
| Carrots | — | — | May 13 – Jun 10 | — |
| Beets | — | — | May 13 – Jun 10 | Jul 3 – Jul 17 |
| Potatoes | — | — | May 13 – Jun 3 | — |
| Swiss Chard | — | — | May 20 – Jun 17 | Jul 3 – Jul 17 |
| Cilantro | — | — | May 20 – Jun 10 | Jul 17 – Aug 7 |
| Green Beans | — | — | Jun 10 – Jul 1 | — |
| Sweet Corn | — | — | Jun 10 – Jun 24 | — |
| Sweet Potatoes Warning: Your frost-free season is about 100 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 17 – Jul 8 | — | — |
| Garlic | — | — | — | Aug 28 – Oct 2 |
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 Hamer 4 Nw, ID weather station, 7 km away (elevation 4,790 ft (1,460 m)).
Frost dates near Hamer
- Terreton Jun 3 · Sep 11
- Roberts May 9 · Oct 5
- Menan May 9 · Oct 5
- Dubois May 18 · Sep 30
- Lewisville May 9 · Oct 5
- Monteview Jun 12 · Sep 7
- Parker May 17 · Sep 22
- Rigby May 9 · Oct 5
- Rexburg May 12 · Sep 24
- Saint Anthony May 17 · Sep 22
Frequently asked questions
When is the last frost in Hamer, ID?
The median last spring frost in Hamer, ID is June 3. There is still about a 10% chance of frost after June 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Hamer, ID?
The median first fall frost is September 11, with about a 10% chance of frost before August 30.
How long is the growing season in Hamer, ID?
About 100 days between the median last spring frost and first fall frost.
What planting zone is Hamer, ID?
Hamer, ID is in USDA hardiness zone 5a.