Lostine, OR frost dates
Last spring frostJun 7median date
First fall frostSep 9median date
Growing season94 daysfrost-free
Hardiness zone6aZone 6a
How Lostine compares
- In 8 years out of 10, the last spring frost in Lostine falls between May 14 and July 7, a 54-day window. The first fall frost falls between August 24 and September 27.
- The median last frost is 52 days later than the Oregon median of Apr 16.
- Its 94-day growing season is longer than 3% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 39 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 171 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 14 |
| 50% (median) | June 7 |
| 10% (safe for tender plants) | July 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 24 |
| 50% (median) | September 9 |
| 90% (late) | September 27 |
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 Lostine, OR
Lostine, OR frost dates — last frost Jun 7, first frost Sep 9, zone 6a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 15 to Mar 29Transplant outside: May 10 to May 24
Start indoors: Mar 29 to Apr 12Transplant outside: Jun 21 to Jul 5
Start indoors: Mar 29 to Apr 12Transplant outside: Jun 21 to Jul 5
Start indoors: Apr 12 to Apr 26Transplant outside: Jun 14 to Jun 28
Start indoors: Apr 12 to Apr 26Transplant outside: May 17 to May 31Sow outdoors: May 10 to Jun 14Plant for fall: Jul 15 to Aug 12
Start indoors: Apr 12 to Apr 26Transplant outside: May 10 to May 24Sow outdoors: May 10 to May 24Plant for fall: Jul 1 to Jul 22
Start indoors: Apr 12 to Apr 26Transplant outside: May 24 to Jun 7
Start indoors: Apr 12 to Apr 26Transplant outside: May 17 to May 31
Start indoors: Apr 12 to Apr 26Transplant outside: May 24 to Jun 7
Start indoors: Apr 26 to May 10Transplant outside: Jun 28 to Jul 12Sow outdoors: Jun 28 to Jul 12
Start indoors: Apr 26 to May 10Transplant outside: Jun 14 to Jun 28
Sow outdoors: Apr 26 to May 17
Sow outdoors: Apr 26 to May 17Plant for fall: Jul 15 to Aug 5
Sow outdoors: May 3 to Jun 14Plant for fall: Jul 29 to Aug 19
Start indoors: May 10 to May 17Transplant outside: Jun 21 to Jun 28Sow outdoors: Jun 14 to Jun 28
Start indoors: May 10 to May 17Sow outdoors: Jun 14 to Jun 28
Start indoors: May 10 to May 17Sow outdoors: Jun 14 to Jun 28
Start indoors: May 10 to May 17Transplant outside: Jun 21 to Jul 5
Sow outdoors: May 17 to Jun 14
Sow outdoors: May 17 to Jun 14Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 17 to Jun 7
Sow outdoors: May 24 to Jun 21
Sow outdoors: May 24 to Jun 14Plant for fall: Jul 15 to Aug 5
Sow outdoors: Jun 14 to Jul 5
Sow outdoors: Jun 14 to Jun 28
Transplant outside: Jun 21 to Jul 12
Plant for fall: Aug 26 to Sep 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Lostine, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 15 – Mar 29 | May 10 – May 24 | — | — |
| Peppers | Mar 29 – Apr 12 | Jun 21 – Jul 5 | — | — |
| Eggplant | Mar 29 – Apr 12 | Jun 21 – Jul 5 | — | — |
| Tomatoes | Apr 12 – Apr 26 | Jun 14 – Jun 28 | — | — |
| Lettuce | Apr 12 – Apr 26 | May 17 – May 31 | May 10 – Jun 14 | Jul 15 – Aug 12 |
| Kale | Apr 12 – Apr 26 | May 10 – May 24 | May 10 – May 24 | Jul 1 – Jul 22 |
| Broccoli | Apr 12 – Apr 26 | May 24 – Jun 7 | — | — |
| Cabbage | Apr 12 – Apr 26 | May 17 – May 31 | — | — |
| Cauliflower | Apr 12 – Apr 26 | May 24 – Jun 7 | — | — |
| Okra | Apr 26 – May 10 | Jun 28 – Jul 12 | Jun 28 – Jul 12 | — |
| Basil | Apr 26 – May 10 | Jun 14 – Jun 28 | — | — |
| Peas | — | — | Apr 26 – May 17 | — |
| Spinach | — | — | Apr 26 – May 17 | Jul 15 – Aug 5 |
| Radishes | — | — | May 3 – Jun 14 | Jul 29 – Aug 19 |
| Cucumbers | May 10 – May 17 | Jun 21 – Jun 28 | Jun 14 – Jun 28 | — |
| Zucchini & Summer Squash | May 10 – May 17 | — | Jun 14 – Jun 28 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 94 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 10 – May 17 | — | Jun 14 – Jun 28 | — |
| Melons & Watermelon Warning: Your frost-free season is about 94 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 10 – May 17 | Jun 21 – Jul 5 | — | — |
| Carrots | — | — | May 17 – Jun 14 | — |
| Beets | — | — | May 17 – Jun 14 | Jul 1 – Jul 15 |
| Potatoes | — | — | May 17 – Jun 7 | — |
| Swiss Chard | — | — | May 24 – Jun 21 | — |
| Cilantro | — | — | May 24 – Jun 14 | Jul 15 – Aug 5 |
| Green Beans | — | — | Jun 14 – Jul 5 | — |
| Sweet Corn | — | — | Jun 14 – Jun 28 | — |
| Sweet Potatoes Warning: Your frost-free season is about 94 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 21 – Jul 12 | — | — |
| Garlic | — | — | — | Aug 26 – Sep 30 |
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 Wallowa, OR weather station, 11 km away (elevation 2,923 ft (891 m)).
Frost dates near Lostine
- Wallowa Jun 7 · Sep 9
- Enterprise May 24 · Oct 1
- Joseph May 24 · Oct 1
- Cove May 11 · Sep 26
- Elgin May 24 · Sep 18
- Imbler May 24 · Sep 18
- Union May 11 · Sep 26
- Summerville May 24 · Sep 18
- Imnaha Jun 8 · Sep 5
- La Grande May 6 · Oct 1
Frequently asked questions
When is the last frost in Lostine, OR?
The median last spring frost in Lostine, OR is June 7. There is still about a 10% chance of frost after July 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Lostine, OR?
The median first fall frost is September 9, with about a 10% chance of frost before August 24.
How long is the growing season in Lostine, OR?
About 94 days between the median last spring frost and first fall frost.
What planting zone is Lostine, OR?
Lostine, OR is in USDA hardiness zone 6a.