Junction City, OR frost dates
Last spring frostApr 11median date
First fall frostOct 23median date
Growing season195 daysfrost-free
Hardiness zone8bZone 8b
How Junction City compares
- In 8 years out of 10, the last spring frost in Junction City falls between March 15 and May 9, a 55-day window. The first fall frost falls between October 6 and November 13.
- The median last frost is 5 days earlier than the Oregon median of Apr 16.
- Its 195-day growing season is longer than 52% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 26 days later than the zone 8b median of Mar 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8b chart.
- The weather station records an average of 52 nights a year at or below 32°F.
- Junction City shares its weather station with Eugene, OR, 18 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 15 |
| 50% (median) | April 11 |
| 10% (safe for tender plants) | May 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 6 |
| 50% (median) | October 23 |
| 90% (late) | November 13 |
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 Junction City, OR
Junction City, OR frost dates — last frost Apr 11, first frost Oct 23, zone 8b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Jan 17 to Jan 31Transplant outside: Mar 14 to Mar 28
Start indoors: Jan 31 to Feb 14Transplant outside: Apr 25 to May 9
Start indoors: Jan 31 to Feb 14Transplant outside: Apr 25 to May 9
Start indoors: Feb 14 to Feb 28Transplant outside: Apr 18 to May 2
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 21 to Apr 4Sow outdoors: Mar 14 to Apr 18Plant for fall: Aug 28 to Sep 25
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 14 to Mar 28Sow outdoors: Mar 14 to Mar 28Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 21 to Apr 4Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 28 to Mar 14Transplant outside: May 2 to May 16Sow outdoors: May 2 to May 16
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 18 to May 2
Sow outdoors: Feb 28 to Mar 21Plant for fall: Jul 31 to Aug 21
Sow outdoors: Feb 28 to Mar 21Plant for fall: Aug 28 to Sep 18
Sow outdoors: Mar 7 to Apr 18Plant for fall: Sep 11 to Oct 2
Start indoors: Mar 14 to Mar 21Transplant outside: Apr 25 to May 2Sow outdoors: Apr 18 to May 2Plant for fall: Aug 7 to Aug 21
Start indoors: Mar 14 to Mar 21Sow outdoors: Apr 18 to May 2Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 14 to Mar 21Sow outdoors: Apr 18 to May 2
Start indoors: Mar 14 to Mar 21Transplant outside: Apr 25 to May 9
Sow outdoors: Mar 21 to Apr 18Plant for fall: Jul 31 to Aug 14
Sow outdoors: Mar 21 to Apr 18Plant for fall: Aug 14 to Aug 28
Sow outdoors: Mar 21 to Apr 11
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 14 to Aug 28
Sow outdoors: Mar 28 to Apr 18Plant for fall: Aug 28 to Sep 18
Sow outdoors: Apr 18 to May 9Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 18 to May 2
Transplant outside: Apr 25 to May 16
Plant for fall: Oct 9 to Nov 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Junction City, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 17 – Jan 31 | Mar 14 – Mar 28 | — | — |
| Peppers | Jan 31 – Feb 14 | Apr 25 – May 9 | — | — |
| Eggplant | Jan 31 – Feb 14 | Apr 25 – May 9 | — | — |
| Tomatoes | Feb 14 – Feb 28 | Apr 18 – May 2 | — | — |
| Lettuce | Feb 14 – Feb 28 | Mar 21 – Apr 4 | Mar 14 – Apr 18 | Aug 28 – Sep 25 |
| Kale | Feb 14 – Feb 28 | Mar 14 – Mar 28 | Mar 14 – Mar 28 | Aug 14 – Sep 4 |
| Broccoli | Feb 14 – Feb 28 | Mar 28 – Apr 11 | — | Jul 17 – Aug 7 |
| Cabbage | Feb 14 – Feb 28 | Mar 21 – Apr 4 | — | Jul 17 – Aug 7 |
| Cauliflower | Feb 14 – Feb 28 | Mar 28 – Apr 11 | — | Jul 17 – Aug 7 |
| Okra | Feb 28 – Mar 14 | May 2 – May 16 | May 2 – May 16 | — |
| Basil | Feb 28 – Mar 14 | Apr 18 – May 2 | — | — |
| Peas | — | — | Feb 28 – Mar 21 | Jul 31 – Aug 21 |
| Spinach | — | — | Feb 28 – Mar 21 | Aug 28 – Sep 18 |
| Radishes | — | — | Mar 7 – Apr 18 | Sep 11 – Oct 2 |
| Cucumbers | Mar 14 – Mar 21 | Apr 25 – May 2 | Apr 18 – May 2 | Aug 7 – Aug 21 |
| Zucchini & Summer Squash | Mar 14 – Mar 21 | — | Apr 18 – May 2 | Aug 14 – Aug 28 |
| Winter Squash & Pumpkins | Mar 14 – Mar 21 | — | Apr 18 – May 2 | — |
| Melons & Watermelon | Mar 14 – Mar 21 | Apr 25 – May 9 | — | — |
| Carrots | — | — | Mar 21 – Apr 18 | Jul 31 – Aug 14 |
| Beets | — | — | Mar 21 – Apr 18 | Aug 14 – Aug 28 |
| Potatoes | — | — | Mar 21 – Apr 11 | — |
| Swiss Chard | — | — | Mar 28 – Apr 25 | Aug 14 – Aug 28 |
| Cilantro | — | — | Mar 28 – Apr 18 | Aug 28 – Sep 18 |
| Green Beans | — | — | Apr 18 – May 9 | Aug 7 – Aug 21 |
| Sweet Corn | — | — | Apr 18 – May 2 | — |
| Sweet Potatoes | — | Apr 25 – May 16 | — | — |
| Garlic | — | — | — | Oct 9 – Nov 13 |
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 Eugene Mahlon Sweet Ap, OR weather station, 8 km away (elevation 354 ft (108 m)).
Frost dates near Junction City
- Alvadore Apr 11 · Oct 23
- Harrisburg Apr 11 · Oct 23
- Cheshire Apr 11 · Oct 23
- Monroe Apr 11 · Oct 30
- Elmira Apr 18 · Oct 25
- Eugene Apr 11 · Oct 23
- Veneta Apr 18 · Oct 25
- Noti Apr 18 · Oct 25
- Halsey Apr 11 · Oct 30
- Blachly Apr 18 · Oct 25
Frequently asked questions
When is the last frost in Junction City, OR?
The median last spring frost in Junction City, OR is April 11. There is still about a 10% chance of frost after May 9, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Junction City, OR?
The median first fall frost is October 23, with about a 10% chance of frost before October 6.
How long is the growing season in Junction City, OR?
About 195 days between the median last spring frost and first fall frost.
What planting zone is Junction City, OR?
Junction City, OR is in USDA hardiness zone 8b.