Post, OR frost dates
Last spring frostJun 2median date
First fall frostSep 17median date
Growing season107 daysfrost-free
Hardiness zone6aZone 6a
How Post compares
- In 8 years out of 10, the last spring frost in Post falls between May 13 and June 25, a 43-day window. The first fall frost falls between August 30 and October 1.
- The median last frost is 47 days later than the Oregon median of Apr 16.
- Its 107-day growing season is longer than 8% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 34 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 175 nights a year at or below 32°F.
- Compared with Bend, OR, 82 km away, the last frost here is 4 days earlier than there and the growing season is 1 day longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 13 |
| 50% (median) | June 2 |
| 10% (safe for tender plants) | June 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 30 |
| 50% (median) | September 17 |
| 90% (late) | October 1 |
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 Post, OR
Post, OR frost dates — last frost Jun 2, first frost Sep 17, zone 6a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 10 to Mar 24Transplant outside: May 5 to May 19
Start indoors: Mar 24 to Apr 7Transplant outside: Jun 16 to Jun 30
Start indoors: Mar 24 to Apr 7Transplant outside: Jun 16 to Jun 30
Start indoors: Apr 7 to Apr 21Transplant outside: Jun 9 to Jun 23
Start indoors: Apr 7 to Apr 21Transplant outside: May 12 to May 26Sow outdoors: May 5 to Jun 9Plant for fall: Jul 23 to Aug 20
Start indoors: Apr 7 to Apr 21Transplant outside: May 5 to May 19Sow outdoors: May 5 to May 19Plant for fall: Jul 9 to Jul 30
Start indoors: Apr 7 to Apr 21Transplant outside: May 19 to Jun 2
Start indoors: Apr 7 to Apr 21Transplant outside: May 12 to May 26
Start indoors: Apr 7 to Apr 21Transplant outside: May 19 to Jun 2
Start indoors: Apr 21 to May 5Transplant outside: Jun 23 to Jul 7Sow outdoors: Jun 23 to Jul 7
Start indoors: Apr 21 to May 5Transplant outside: Jun 9 to Jun 23
Sow outdoors: Apr 21 to May 12Plant for fall: Jun 25 to Jul 16
Sow outdoors: Apr 21 to May 12Plant for fall: Jul 23 to Aug 13
Sow outdoors: Apr 28 to Jun 9Plant for fall: Aug 6 to Aug 27
Start indoors: May 5 to May 12Transplant outside: Jun 16 to Jun 23Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Sow outdoors: Jun 9 to Jun 23Plant for fall: Jul 9 to Jul 23
Start indoors: May 5 to May 12Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Transplant outside: Jun 16 to Jun 30
Sow outdoors: May 12 to Jun 9Plant for fall: Jun 25 to Jul 9
Sow outdoors: May 12 to Jun 9Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 12 to Jun 2
Sow outdoors: May 19 to Jun 16Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 19 to Jun 9Plant for fall: Jul 23 to Aug 13
Sow outdoors: Jun 9 to Jun 30
Sow outdoors: Jun 9 to Jun 23
Transplant outside: Jun 16 to Jul 7
Plant for fall: Sep 3 to Oct 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Post, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 10 – Mar 24 | May 5 – May 19 | — | — |
| Peppers | Mar 24 – Apr 7 | Jun 16 – Jun 30 | — | — |
| Eggplant | Mar 24 – Apr 7 | Jun 16 – Jun 30 | — | — |
| Tomatoes | Apr 7 – Apr 21 | Jun 9 – Jun 23 | — | — |
| Lettuce | Apr 7 – Apr 21 | May 12 – May 26 | May 5 – Jun 9 | Jul 23 – Aug 20 |
| Kale | Apr 7 – Apr 21 | May 5 – May 19 | May 5 – May 19 | Jul 9 – Jul 30 |
| Broccoli | Apr 7 – Apr 21 | May 19 – Jun 2 | — | — |
| Cabbage | Apr 7 – Apr 21 | May 12 – May 26 | — | — |
| Cauliflower | Apr 7 – Apr 21 | May 19 – Jun 2 | — | — |
| Okra | Apr 21 – May 5 | Jun 23 – Jul 7 | Jun 23 – Jul 7 | — |
| Basil | Apr 21 – May 5 | Jun 9 – Jun 23 | — | — |
| Peas | — | — | Apr 21 – May 12 | Jun 25 – Jul 16 |
| Spinach | — | — | Apr 21 – May 12 | Jul 23 – Aug 13 |
| Radishes | — | — | Apr 28 – Jun 9 | Aug 6 – Aug 27 |
| Cucumbers | May 5 – May 12 | Jun 16 – Jun 23 | Jun 9 – Jun 23 | — |
| Zucchini & Summer Squash | May 5 – May 12 | — | Jun 9 – Jun 23 | Jul 9 – Jul 23 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 107 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 5 – May 12 | — | Jun 9 – Jun 23 | — |
| Melons & Watermelon | May 5 – May 12 | Jun 16 – Jun 30 | — | — |
| Carrots | — | — | May 12 – Jun 9 | Jun 25 – Jul 9 |
| Beets | — | — | May 12 – Jun 9 | Jul 9 – Jul 23 |
| Potatoes | — | — | May 12 – Jun 2 | — |
| Swiss Chard | — | — | May 19 – Jun 16 | Jul 9 – Jul 23 |
| Cilantro | — | — | May 19 – Jun 9 | Jul 23 – Aug 13 |
| Green Beans | — | — | Jun 9 – Jun 30 | — |
| Sweet Corn | — | — | Jun 9 – Jun 23 | — |
| Sweet Potatoes Warning: Your frost-free season is about 107 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 16 – Jul 7 | — | — |
| Garlic | — | — | — | Sep 3 – Oct 8 |
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 Barnes Stn, OR weather station, 16 km away (elevation 3,970 ft (1,210 m)).
Frost dates near Post
- Brothers frost any month
- Paulina frost any month
- Prineville Jun 1 · Sep 22
- Mitchell May 22 · Oct 4
- Powell Butte Jun 9 · Sep 14
- Redmond Jun 9 · Sep 14
- Dayville May 4 · Oct 6
- Ashwood May 22 · Oct 3
- Bend Jun 6 · Sep 20
- Terrebonne Jun 9 · Sep 14
Frequently asked questions
When is the last frost in Post, OR?
The median last spring frost in Post, OR is June 2. There is still about a 10% chance of frost after June 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Post, OR?
The median first fall frost is September 17, with about a 10% chance of frost before August 30.
How long is the growing season in Post, OR?
About 107 days between the median last spring frost and first fall frost.
What planting zone is Post, OR?
Post, OR is in USDA hardiness zone 6a.