Merrill, OR frost dates
Last spring frostJun 6median date
First fall frostSep 14median date
Growing season100 daysfrost-free
Hardiness zone6bZone 6b
How Merrill compares
- In 8 years out of 10, the last spring frost in Merrill falls between May 18 and June 23, a 36-day window. The first fall frost falls between August 30 and September 26.
- The median last frost is 51 days later than the Oregon median of Apr 16.
- Its 100-day growing season is longer than 4% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 45 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 182 nights a year at or below 32°F.
- Compared with Medford, OR, 110 km away, the last frost here is 59 days later than there and the growing season is 104 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 18 |
| 50% (median) | June 6 |
| 10% (safe for tender plants) | June 23 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 30 |
| 50% (median) | September 14 |
| 90% (late) | September 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 Merrill, OR
Merrill, OR frost dates — last frost Jun 6, first frost Sep 14, zone 6b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 14 to Mar 28Transplant outside: May 9 to May 23
Start indoors: Mar 28 to Apr 11Transplant outside: Jun 20 to Jul 4
Start indoors: Mar 28 to Apr 11Transplant outside: Jun 20 to Jul 4
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 16 to May 30Sow outdoors: May 9 to Jun 13Plant for fall: Jul 20 to Aug 17
Start indoors: Apr 11 to Apr 25Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 6 to Jul 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 23 to Jun 6
Start indoors: Apr 11 to Apr 25Transplant outside: May 16 to May 30
Start indoors: Apr 11 to Apr 25Transplant outside: May 23 to Jun 6
Start indoors: Apr 25 to May 9Transplant outside: Jun 27 to Jul 11Sow outdoors: Jun 27 to Jul 11
Start indoors: Apr 25 to May 9Transplant outside: Jun 13 to Jun 27
Sow outdoors: Apr 25 to May 16Plant for fall: Jun 22 to Jul 13
Sow outdoors: Apr 25 to May 16Plant for fall: Jul 20 to Aug 10
Sow outdoors: May 2 to Jun 13Plant for fall: Aug 3 to Aug 24
Start indoors: May 9 to May 16Transplant outside: Jun 20 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Transplant outside: Jun 20 to Jul 4
Sow outdoors: May 16 to Jun 13
Sow outdoors: May 16 to Jun 13Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 16 to Jun 6
Sow outdoors: May 23 to Jun 20Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 23 to Jun 13Plant for fall: Jul 20 to Aug 10
Sow outdoors: Jun 13 to Jul 4
Sow outdoors: Jun 13 to Jun 27
Transplant outside: Jun 20 to Jul 11
Plant for fall: Aug 31 to Oct 5
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Merrill, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 14 – Mar 28 | May 9 – May 23 | — | — |
| Peppers | Mar 28 – Apr 11 | Jun 20 – Jul 4 | — | — |
| Eggplant | Mar 28 – Apr 11 | Jun 20 – Jul 4 | — | — |
| Tomatoes | Apr 11 – Apr 25 | Jun 13 – Jun 27 | — | — |
| Lettuce | Apr 11 – Apr 25 | May 16 – May 30 | May 9 – Jun 13 | Jul 20 – Aug 17 |
| Kale | Apr 11 – Apr 25 | May 9 – May 23 | May 9 – May 23 | Jul 6 – Jul 27 |
| Broccoli | Apr 11 – Apr 25 | May 23 – Jun 6 | — | — |
| Cabbage | Apr 11 – Apr 25 | May 16 – May 30 | — | — |
| Cauliflower | Apr 11 – Apr 25 | May 23 – Jun 6 | — | — |
| Okra | Apr 25 – May 9 | Jun 27 – Jul 11 | Jun 27 – Jul 11 | — |
| Basil | Apr 25 – May 9 | Jun 13 – Jun 27 | — | — |
| Peas | — | — | Apr 25 – May 16 | Jun 22 – Jul 13 |
| Spinach | — | — | Apr 25 – May 16 | Jul 20 – Aug 10 |
| Radishes | — | — | May 2 – Jun 13 | Aug 3 – Aug 24 |
| Cucumbers | May 9 – May 16 | Jun 20 – Jun 27 | Jun 13 – Jun 27 | — |
| Zucchini & Summer Squash | May 9 – May 16 | — | Jun 13 – Jun 27 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 100 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 9 – May 16 | — | Jun 13 – Jun 27 | — |
| Melons & Watermelon | May 9 – May 16 | Jun 20 – Jul 4 | — | — |
| Carrots | — | — | May 16 – Jun 13 | — |
| Beets | — | — | May 16 – Jun 13 | Jul 6 – Jul 20 |
| Potatoes | — | — | May 16 – Jun 6 | — |
| Swiss Chard | — | — | May 23 – Jun 20 | Jul 6 – Jul 20 |
| Cilantro | — | — | May 23 – Jun 13 | Jul 20 – Aug 10 |
| Green Beans | — | — | Jun 13 – Jul 4 | — |
| Sweet Corn | — | — | Jun 13 – Jun 27 | — |
| Sweet Potatoes Warning: Your frost-free season is about 100 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 20 – Jul 11 | — | — |
| Garlic | — | — | — | Aug 31 – Oct 5 |
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 Tulelake, CA weather station, 13 km away (elevation 4,039 ft (1,231 m)).
Frost dates near Merrill
- Malin Jun 6 · Sep 14
- Midland Jun 5 · Sep 20
- Dairy Jun 9 · Sep 18
- Klamath Falls Jun 9 · Sep 18
- Keno Jun 5 · Sep 20
- Bonanza May 31 · Sep 21
- Sprague River May 31 · Sep 21
- Beatty May 31 · Sep 21
- Chiloquin frost any month
- Bly May 31 · Sep 21
Frequently asked questions
When is the last frost in Merrill, OR?
The median last spring frost in Merrill, OR is June 6. There is still about a 10% chance of frost after June 23, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Merrill, OR?
The median first fall frost is September 14, with about a 10% chance of frost before August 30.
How long is the growing season in Merrill, OR?
About 100 days between the median last spring frost and first fall frost.
What planting zone is Merrill, OR?
Merrill, OR is in USDA hardiness zone 6b.