Phoenix, OR frost dates
Last spring frostMay 6median date
First fall frostOct 8median date
Growing season155 daysfrost-free
Hardiness zone8bZone 8b
How Phoenix compares
- In 8 years out of 10, the last spring frost in Phoenix falls between April 20 and May 27, a 37-day window. The first fall frost falls between September 21 and October 26.
- The median last frost is 20 days later than the Oregon median of Apr 16.
- Its 155-day growing season is longer than 28% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 51 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 115 nights a year at or below 32°F.
- Compared with Medford, OR, 5 km away, the last frost here is 28 days later than there and the growing season is 49 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 20 |
| 50% (median) | May 6 |
| 10% (safe for tender plants) | May 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 21 |
| 50% (median) | October 8 |
| 90% (late) | October 26 |
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 Phoenix, OR
Phoenix, OR frost dates — last frost May 6, first frost Oct 8, zone 8b. whenisthelastfrost.com
Crop
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Start indoors: Feb 11 to Feb 25Transplant outside: Apr 8 to Apr 22
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Mar 11 to Mar 25Transplant outside: May 13 to May 27
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Sow outdoors: Apr 8 to May 13Plant for fall: Aug 13 to Sep 10
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 8 to Apr 22Sow outdoors: Apr 8 to Apr 22Plant for fall: Jul 30 to Aug 20
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jul 2 to Jul 23
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Plant for fall: Jul 2 to Jul 23
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jul 2 to Jul 23
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10Sow outdoors: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: May 13 to May 27
Sow outdoors: Mar 25 to Apr 15Plant for fall: Jul 16 to Aug 6
Sow outdoors: Mar 25 to Apr 15Plant for fall: Aug 13 to Sep 3
Sow outdoors: Apr 1 to May 13Plant for fall: Aug 27 to Sep 17
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to May 27Sow outdoors: May 13 to May 27Plant for fall: Jul 23 to Aug 6
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27Plant for fall: Jul 30 to Aug 13
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to Jun 3
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 16 to Jul 30
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 30 to Aug 13
Sow outdoors: Apr 15 to May 6
Sow outdoors: Apr 22 to May 20Plant for fall: Jul 30 to Aug 13
Sow outdoors: Apr 22 to May 13Plant for fall: Aug 13 to Sep 3
Sow outdoors: May 13 to Jun 3Plant for fall: Jul 23 to Aug 6
Sow outdoors: May 13 to May 27
Transplant outside: May 20 to Jun 10
Plant for fall: Sep 24 to Oct 29
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Phoenix, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 11 – Feb 25 | Apr 8 – Apr 22 | — | — |
| Peppers | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Eggplant | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Tomatoes | Mar 11 – Mar 25 | May 13 – May 27 | — | — |
| Lettuce | Mar 11 – Mar 25 | Apr 15 – Apr 29 | Apr 8 – May 13 | Aug 13 – Sep 10 |
| Kale | Mar 11 – Mar 25 | Apr 8 – Apr 22 | Apr 8 – Apr 22 | Jul 30 – Aug 20 |
| Broccoli | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jul 2 – Jul 23 |
| Cabbage | Mar 11 – Mar 25 | Apr 15 – Apr 29 | — | Jul 2 – Jul 23 |
| Cauliflower | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jul 2 – Jul 23 |
| Okra | Mar 25 – Apr 8 | May 27 – Jun 10 | May 27 – Jun 10 | — |
| Basil | Mar 25 – Apr 8 | May 13 – May 27 | — | — |
| Peas | — | — | Mar 25 – Apr 15 | Jul 16 – Aug 6 |
| Spinach | — | — | Mar 25 – Apr 15 | Aug 13 – Sep 3 |
| Radishes | — | — | Apr 1 – May 13 | Aug 27 – Sep 17 |
| Cucumbers | Apr 8 – Apr 15 | May 20 – May 27 | May 13 – May 27 | Jul 23 – Aug 6 |
| Zucchini & Summer Squash | Apr 8 – Apr 15 | — | May 13 – May 27 | Jul 30 – Aug 13 |
| Winter Squash & Pumpkins | Apr 8 – Apr 15 | — | May 13 – May 27 | — |
| Melons & Watermelon | Apr 8 – Apr 15 | May 20 – Jun 3 | — | — |
| Carrots | — | — | Apr 15 – May 13 | Jul 16 – Jul 30 |
| Beets | — | — | Apr 15 – May 13 | Jul 30 – Aug 13 |
| Potatoes | — | — | Apr 15 – May 6 | — |
| Swiss Chard | — | — | Apr 22 – May 20 | Jul 30 – Aug 13 |
| Cilantro | — | — | Apr 22 – May 13 | Aug 13 – Sep 3 |
| Green Beans | — | — | May 13 – Jun 3 | Jul 23 – Aug 6 |
| Sweet Corn | — | — | May 13 – May 27 | — |
| Sweet Potatoes | — | May 20 – Jun 10 | — | — |
| Garlic | — | — | — | Sep 24 – Oct 29 |
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 Ashland, OR weather station, 11 km away (elevation 1,729 ft (527 m)).
Frost dates near Phoenix
- Medford Apr 8 · Oct 29
- Talent May 6 · Oct 8
- Ashland May 6 · Oct 8
- Central Point Apr 8 · Oct 29
- White City Apr 8 · Oct 29
- Jacksonville May 4 · Oct 13
- Eagle Point Apr 8 · Oct 29
- Gold Hill Apr 8 · Oct 29
- Rogue River Apr 8 · Oct 28
- Butte Falls Apr 29 · Oct 17
Frequently asked questions
When is the last frost in Phoenix, OR?
The median last spring frost in Phoenix, OR is May 6. There is still about a 10% chance of frost after May 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Phoenix, OR?
The median first fall frost is October 8, with about a 10% chance of frost before September 21.
How long is the growing season in Phoenix, OR?
About 155 days between the median last spring frost and first fall frost.
What planting zone is Phoenix, OR?
Phoenix, OR is in USDA hardiness zone 8b.