Mosier, OR frost dates
Last spring frostApr 20median date
First fall frostOct 13median date
Growing season176 daysfrost-free
Hardiness zone7bZone 7b
How Mosier compares
- In 8 years out of 10, the last spring frost in Mosier falls between March 29 and May 9, a 41-day window. The first fall frost falls between September 30 and November 1.
- The median last frost is 4 days later than the Oregon median of Apr 16.
- Its 176-day growing season is longer than 39% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 15 days later than the zone 7b median of Apr 5. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7b chart.
- The weather station records an average of 92 nights a year at or below 32°F.
- Compared with Gresham, OR, 83 km away, the last frost here is 35 days later than there and the growing season is 73 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 29 |
| 50% (median) | April 20 |
| 10% (safe for tender plants) | May 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 30 |
| 50% (median) | October 13 |
| 90% (late) | November 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 Mosier, OR
Mosier, OR frost dates — last frost Apr 20, first frost Oct 13, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 26 to Feb 9Transplant outside: Mar 23 to Apr 6
Start indoors: Feb 9 to Feb 23Transplant outside: May 4 to May 18
Start indoors: Feb 9 to Feb 23Transplant outside: May 4 to May 18
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 27 to May 11
Start indoors: Feb 23 to Mar 9Transplant outside: Mar 30 to Apr 13Sow outdoors: Mar 23 to Apr 27Plant for fall: Aug 18 to Sep 15
Start indoors: Feb 23 to Mar 9Transplant outside: Mar 23 to Apr 6Sow outdoors: Mar 23 to Apr 6Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 6 to Apr 20Plant for fall: Jul 7 to Jul 28
Start indoors: Feb 23 to Mar 9Transplant outside: Mar 30 to Apr 13Plant for fall: Jul 7 to Jul 28
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 6 to Apr 20Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 9 to Mar 23Transplant outside: May 11 to May 25Sow outdoors: May 11 to May 25
Start indoors: Mar 9 to Mar 23Transplant outside: Apr 27 to May 11
Sow outdoors: Mar 9 to Mar 30Plant for fall: Jul 21 to Aug 11
Sow outdoors: Mar 9 to Mar 30Plant for fall: Aug 18 to Sep 8
Sow outdoors: Mar 16 to Apr 27Plant for fall: Sep 1 to Sep 22
Start indoors: Mar 23 to Mar 30Transplant outside: May 4 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Jul 28 to Aug 11
Start indoors: Mar 23 to Mar 30Sow outdoors: Apr 27 to May 11Plant for fall: Aug 4 to Aug 18
Start indoors: Mar 23 to Mar 30Sow outdoors: Apr 27 to May 11
Start indoors: Mar 23 to Mar 30Transplant outside: May 4 to May 18
Sow outdoors: Mar 30 to Apr 27Plant for fall: Jul 21 to Aug 4
Sow outdoors: Mar 30 to Apr 27Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 30 to Apr 20
Sow outdoors: Apr 6 to May 4Plant for fall: Aug 4 to Aug 18
Sow outdoors: Apr 6 to Apr 27Plant for fall: Aug 18 to Sep 8
Sow outdoors: Apr 27 to May 18Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 27 to May 11
Transplant outside: May 4 to May 25
Plant for fall: Sep 29 to Nov 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mosier, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 26 – Feb 9 | Mar 23 – Apr 6 | — | — |
| Peppers | Feb 9 – Feb 23 | May 4 – May 18 | — | — |
| Eggplant | Feb 9 – Feb 23 | May 4 – May 18 | — | — |
| Tomatoes | Feb 23 – Mar 9 | Apr 27 – May 11 | — | — |
| Lettuce | Feb 23 – Mar 9 | Mar 30 – Apr 13 | Mar 23 – Apr 27 | Aug 18 – Sep 15 |
| Kale | Feb 23 – Mar 9 | Mar 23 – Apr 6 | Mar 23 – Apr 6 | Aug 4 – Aug 25 |
| Broccoli | Feb 23 – Mar 9 | Apr 6 – Apr 20 | — | Jul 7 – Jul 28 |
| Cabbage | Feb 23 – Mar 9 | Mar 30 – Apr 13 | — | Jul 7 – Jul 28 |
| Cauliflower | Feb 23 – Mar 9 | Apr 6 – Apr 20 | — | Jul 7 – Jul 28 |
| Okra | Mar 9 – Mar 23 | May 11 – May 25 | May 11 – May 25 | — |
| Basil | Mar 9 – Mar 23 | Apr 27 – May 11 | — | — |
| Peas | — | — | Mar 9 – Mar 30 | Jul 21 – Aug 11 |
| Spinach | — | — | Mar 9 – Mar 30 | Aug 18 – Sep 8 |
| Radishes | — | — | Mar 16 – Apr 27 | Sep 1 – Sep 22 |
| Cucumbers | Mar 23 – Mar 30 | May 4 – May 11 | Apr 27 – May 11 | Jul 28 – Aug 11 |
| Zucchini & Summer Squash | Mar 23 – Mar 30 | — | Apr 27 – May 11 | Aug 4 – Aug 18 |
| Winter Squash & Pumpkins | Mar 23 – Mar 30 | — | Apr 27 – May 11 | — |
| Melons & Watermelon | Mar 23 – Mar 30 | May 4 – May 18 | — | — |
| Carrots | — | — | Mar 30 – Apr 27 | Jul 21 – Aug 4 |
| Beets | — | — | Mar 30 – Apr 27 | Aug 4 – Aug 18 |
| Potatoes | — | — | Mar 30 – Apr 20 | — |
| Swiss Chard | — | — | Apr 6 – May 4 | Aug 4 – Aug 18 |
| Cilantro | — | — | Apr 6 – Apr 27 | Aug 18 – Sep 8 |
| Green Beans | — | — | Apr 27 – May 18 | Jul 28 – Aug 11 |
| Sweet Corn | — | — | Apr 27 – May 11 | — |
| Sweet Potatoes | — | May 4 – May 25 | — | — |
| Garlic | — | — | — | Sep 29 – Nov 3 |
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 Hood Rvr Exp Stn, OR weather station, 11 km away (elevation 499 ft (152 m)).
Frost dates near Mosier
- Odell Apr 20 · Oct 13
- Hood River Apr 20 · Oct 13
- The Dalles Apr 14 · Oct 23
- Mount Hood Parkdale May 13 · Oct 3
- Dufur May 12 · Oct 7
- Cascade Locks Mar 24 · Nov 20
- Tygh Valley May 12 · Oct 7
- Government Camp May 27 · Oct 9
- Rufus May 19 · Sep 25
- Wasco May 12 · Oct 4
Frequently asked questions
When is the last frost in Mosier, OR?
The median last spring frost in Mosier, OR is April 20. 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 Mosier, OR?
The median first fall frost is October 13, with about a 10% chance of frost before September 30.
How long is the growing season in Mosier, OR?
About 176 days between the median last spring frost and first fall frost.
What planting zone is Mosier, OR?
Mosier, OR is in USDA hardiness zone 7b.