Frost Dates & Planting Calendar for Newberg, OR
Plan your garden around Newberg, OR's typical frost-free growing season, using NOAA climate normals and a 42-crop planting calendar built for this location.
Last Spring Frost
March 21
Safe Apr 19
Typical Mar 21
Risky Feb 23
First Fall Frost
November 22
Safe Nov 4
Typical Nov 22
Risky Dec 12
Growing Season
241 days
Typical last frost to typical first frost.
USDA Hardiness Zone
Zone 8b
Mild winters and a long growing season, room for both cool- and warm-season crops.
Data: NOAA station REX 1 S, OR US, 4.7 km away.
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days until the typical last spring frost
Monthly Temperatures
Avg. high
Avg. temp
Avg. low
Planting Calendar
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Tomato | Jan 24 – Feb 7 | — | Mar 28 – Apr 4 | — | 60–85 days | Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed. |
| Pepper | Jan 10 – Jan 24 | — | Mar 28 – Apr 11 | — | 60–90 days | Slow to germinate; start indoors 8-10 weeks before last frost. Transplant only once nights stay above 55F, 1-3 weeks after last frost. |
| Eggplant | Jan 10 – Jan 24 | — | Apr 4 – Apr 11 | — | 65–85 days | Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant. |
| Cucumber | Feb 21 – Feb 28 | Mar 28 – Apr 4 | Mar 28 – Apr 4 | — | 50–65 days | Can be started indoors 3-4 weeks before transplanting, or direct-sown 1-2 weeks after last frost once soil is warm. |
| Zucchini | Feb 28 – Mar 7 | Mar 28 – Apr 11 | Mar 28 – Apr 4 | — | 45–55 days | Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start. |
| Winter Squash | Feb 21 – Feb 28 | Mar 28 – Apr 11 | Mar 28 – Apr 4 | — | 80–110 days | Long season; direct sow after soil warms, or start indoors 3-4 weeks before last frost in short-season climates. |
| Pumpkin | — | Mar 28 – Apr 11 | — | — | 90–120 days | Direct sow 1-3 weeks after last frost; back-time from your first fall frost so the 90-120 day maturity window lands before it. |
| Watermelon | Feb 21 – Feb 28 | — | Apr 4 – Apr 11 | — | 70–90 days | Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost. |
| Cantaloupe | Feb 21 – Feb 28 | — | Apr 4 – Apr 11 | — | 70–90 days | Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting. |
| Corn | — | Mar 21 – Apr 4 | — | — | 60–100 days | Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks. |
| Green Bean | — | Mar 21 – Apr 4 | — | — | 50–65 days | Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush. |
| Pea | — | Feb 7 – Feb 21 | — | — | 55–70 days | Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Lettuce | — | Feb 21 – Mar 7 | — | Sep 27 – Oct 11 | 45–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts. |
| Spinach | — | Feb 7 – Feb 21 | — | Sep 27 – Oct 11 | 40–50 days | Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Kale | — | Feb 21 – Mar 7 | — | Sep 13 – Sep 27 | 50–65 days | Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants. |
| Arugula | — | Feb 21 – Mar 7 | — | Oct 11 – Oct 18 | 30–40 days | Fast-growing, cold-tolerant green; direct sow 2-4 weeks before last frost, succession sow every 2-3 weeks. |
| Swiss Chard | — | Feb 28 – Mar 14 | — | — | 50–60 days | Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too. |
| Broccoli | Jan 31 – Feb 14 | — | Feb 28 – Mar 7 | Sep 20 – Sep 27 | 55–80 days | Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost). |
| Cauliflower | Jan 31 – Feb 14 | — | Mar 7 – Mar 14 | Sep 13 – Sep 20 | 55–85 days | Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost. |
| Cabbage | Jan 31 – Feb 14 | — | Feb 21 – Mar 7 | Sep 13 – Sep 27 | 60–100 days | Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost. |
| Brussels Sprouts | Jan 31 – Feb 14 | — | Feb 28 – Mar 14 | — | 90–110 days | Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost. |
| Carrot | — | Feb 21 – Mar 7 | — | Aug 30 – Sep 13 | 60–80 days | Direct sow only (does not transplant); sow 2-4 weeks before last frost, as soon as soil can be worked. |
| Beet | — | Feb 21 – Mar 7 | — | Sep 13 – Sep 27 | 50–65 days | Direct sow 2-4 weeks before last frost; tolerates light frost. |
| Radish | — | Feb 14 – Feb 28 | — | Oct 11 – Oct 25 | 22–30 days | Very fast and cold-hardy; direct sow 3-5 weeks before last frost, as soon as soil can be worked. |
| Turnip | — | Feb 21 – Mar 7 | — | Sep 13 – Sep 27 | 40–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. |
| Onion | Jan 10 – Jan 24 | — | Feb 21 – Mar 7 | — | 90–120 days | Start seeds indoors 8-10 weeks before last frost (or use sets/transplants); set out 2-4 weeks before last frost, very cold-tolerant as seedlings. |
| Garlic | — | — | — | Oct 25 – Nov 8 | 240–270 days | Fall-planted crop only; not planted in spring in most climates. |
| Potato | — | Feb 21 – Mar 7 | — | — | 70–120 days | Plant seed potatoes 2-4 weeks before last frost, as soon as soil can be worked and is above 45F; light frost on emerging foliage is usually tolerated. |
| Sweet Potato | — | — | Apr 4 – Apr 18 | — | 90–120 days | Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive. |
| Asparagus | — | — | Feb 21 – Mar 7 | — | 730–1095 days | Perennial; plant crowns 2-4 weeks before last frost as soon as soil can be worked. Takes 2-3 years to full production. |
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Basil | Feb 7 – Feb 14 | — | Mar 28 – Apr 4 | — | 50–70 days | Very frost/cold sensitive; start indoors 5-6 weeks before last frost, transplant only after all danger of frost (1-2 weeks after) and nights stay warm. |
| Cilantro | — | Feb 28 – Mar 14 | — | Sep 27 – Oct 11 | 45–70 days | Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring. |
| Parsley | Jan 24 – Feb 7 | — | Mar 7 – Mar 14 | — | 70–90 days | Slow to germinate; start indoors 6-8 weeks before last frost, transplant 1-2 weeks before last frost (biennial, cold-tolerant). |
| Dill | — | Feb 28 – Mar 14 | — | — | 40–60 days | Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer. |
| Oregano | Jan 24 – Feb 7 | — | Mar 21 – Mar 28 | — | 80–90 days | Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date. |
| Thyme | Jan 24 – Feb 7 | — | Mar 21 – Mar 28 | — | 85–95 days | Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost. |
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Sunflower | — | Mar 28 – Apr 11 | — | — | 70–100 days | Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting. |
| Zinnia | Feb 21 – Feb 28 | Mar 28 – Apr 11 | Mar 28 – Apr 4 | — | 60–70 days | Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms. |
| Marigold | Feb 7 – Feb 21 | — | Mar 28 – Apr 4 | — | 45–60 days | Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed. |
| Cosmos | Feb 21 – Feb 28 | Mar 28 – Apr 11 | Mar 28 – Apr 4 | — | 60–90 days | Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early. |
| Nasturtium | — | Mar 28 – Apr 11 | — | — | 50–65 days | Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed. |
| Dahlia | — | — | Mar 28 – Apr 11 | — | 90–120 days | Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive. |
Date ranges are estimates based on university extension guidelines and this city's NOAA frost normals — not a guarantee. Scroll to see all columns on narrow screens.
Frequently Asked Questions
When is the last frost in Newberg, OR?
Based on 1991–2020 NOAA climate normals for the REX 1 S, OR US station, the last spring frost in Newberg typically falls around March 21. A cautious gardener might wait until April 19 (only a 10% chance of a later frost), while February 23 marks an earlier, higher-risk planting date.
When is the first frost in Newberg, OR in fall?
The first fall frost in Newberg typically arrives around November 22. To stay safe, assume frost could start as early as November 4; in milder years it can hold off until December 12.
How long is the growing season in Newberg, OR?
Newberg's average frost-free growing season is about 241 days, running from the typical last spring frost (March 21) to the typical first fall frost (November 22).
What USDA hardiness zone is Newberg, OR in?
Newberg, OR is in USDA plant hardiness zone 8b, per the USDA's 2023 Plant Hardiness Zone Map. Mild winters and a long growing season, room for both cool- and warm-season crops.