January in Zone 10
January in Zone 10 (last frost rare or none, first frost rare — december to january in coldest years). There are 44 crops to sow, transplant, or harvest this month.
Quick answer · Updated October 2026
In January, Zone 10 gardeners can plant Tomatoes, Tomatillos, Broccoli, Cabbage, Basil, Marigolds, Watermelon, and Kohlrabi. Zone 10's last frost is around Rare or none and first frost around Rare — December to January in coldest years — the full task list below has exact timing for each crop.
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- Min Winter Temp
- 30 to 40 °F / -1 to 4 °C
- Last Spring Frost
- Rare or none
- First Fall Frost
- Rare — December to January in coldest years
- Growing Season
- Year-round (365 days)
- Annual Rainfall
- 15–65 in
Gardening in January in Zone 10
In Zone 10, January falls in the prime cool-season window. Unlike colder zones, your strongest growing happens now: mild temperatures let you plant a wide range of vegetables that would struggle in the summer heat.
The planting focus in Zone 10 this month is Tomatoes, Tomatillos, Broccoli, Cabbage, Basil, and Marigolds — see the task cards below for exactly how and when to sow each in your conditions.
About January in the garden
January is the heart of winter in most of the US. For gardeners in cold zones, it is a time for planning, seed ordering, and soil improvement. In warm southern zones, winter vegetables are actively growing and some early planting is underway.
Ordering seeds from catalogs, planning garden layouts, pruning dormant trees and shrubs, starting onion and leek seeds indoors in cold zones, harvesting winter vegetables in Zones 8–13.
- Season
- winter
- Temperature trend
- Coldest month of the year in most regions; average temperatures at seasonal low.
- Daylight
- Shortest days; daylight is slowly increasing from the winter solstice.
- Zone 10 last frost
- Rare or none
- Zone 10 first frost
- Rare — December to January in coldest years
17
Sow indoors
17
Sow outdoors
10
Transplant
0
Harvest
1
Maintenance
🌱 Sow indoors
Start these indoors
Get a jump on the season under lights or on a sunny windowsill so transplants are ready when the weather warms.
Sow ¼ in deep in cell trays; keep at 70–75°F. Germinates in 7–10 days.
Sow ¼ in deep at 70°F; treat like tomatoes.
Sow ¼ in deep; ready to transplant in 4–6 weeks at 4–5 in tall.
Sow ¼ in deep; harden off well before setting out.
Surface-sow under lights at 70°F; very frost-tender.
Sow ¼ in deep; quick and reliable from seed.
Sow 1 in deep. Germinates in 5–10 days in warm soil.
Sow ¼–½ in deep. Germinates in 5–10 days.
Sow 1/4–1/2 in deep. Germinates in 4–7 days.
Sow ¼–½ in deep. Germinates in 7–14 days.
Sow ½ in deep. Germinates in 7–14 days.
Sow ¼ in deep. Germinates in 5–14 days.
Sow 1/4 in deep. Germinates in 7–14 days.
Sow ¼–½ in deep. Germinates in 4–7 days.
Sow Surface sow — seeds need light; press gently without covering. Germinates in 7–14 days at 70–75°f.
Sow 1½–2 in deep. Germinates in 7–14 days.
Sow Surface-sow; needs light to germinate — press seed gently into moist soil without covering. Germinates in 7–14 days at 55–70°f.
🌿 Sow outdoors
Sow these directly outdoors
Soil and weather are right to sow these straight into the garden where they will grow.
Sow 1 in deep, 2 in apart as soon as soil is workable; trellis tall types.
Surface-sow and barely cover; succession-sow every 2 weeks for a steady supply.
Sow ½ in deep in cold soil; bolts fast once days lengthen and warm.
Sow ½ in deep, thin to 1 in. Ready in just 3–4 weeks — great for kids and impatient gardeners.
Sow ¼ in deep in loose, stone-free soil; keep surface moist until sprouts appear (2–3 weeks).
Sow ½ in deep; each "seed" is a cluster, so thin to 3 in. Eat the thinnings as greens.
Sow ¼ in deep or transplant; extremely cold-hardy.
Sow ½ in deep; succession-sow — it bolts quickly in heat.
Soak seed, sow 1 in deep in cool soil, and give them something to climb.
Direct-sow ¼ in deep, spacing 4–6 in apart.
Direct-sow ¼–½ in deep, spacing 6 in apart.
Direct-sow ¼ in deep, spacing 6–12 in apart.
Direct-sow 1/4–1/2 in deep, spacing 4–6 in apart (baby) or 10–12 in (full-size).
Direct-sow ¼ in deep, spacing 8–12 in apart.
Direct-sow 1/4 in deep, spacing 6–12 in apart.
Direct-sow ¼–½ in deep, spacing 4–6 in (baby leaf) to 12 in (full-size heads).
Direct-sow Surface-sow; needs light to germinate — press seed gently into moist soil without covering, spacing 6–8 in apart.
🪴 Transplant
Transplant these into the garden
Move hardened-off seedlings into their final beds.
Transplant while still cool; space 18 in apart. Heat ruins the heads.
Transplant 12–18 in apart into firm soil while weather is still cool.
Set out pencil-thick seedlings (or sets) 4 in apart as soon as soil is workable.
Set out 6 in apart, in full sun (6+ hours).
Set out 4–6 in apart (baby) or 10–12 in (full-size), in full sun to part shade (4–6+ hours).
Set out 6–12 in apart, in full sun to part shade (6 hours; some afternoon shade in heat).
Set out 8–12 in apart, in full sun (6+ hours); tolerates light shade.
Set out 4–6 in (baby leaf) to 12 in (full-size heads), in full sun to part shade (4–6+ hours).
Set out 4–6 in apart, in rows 18–24 in wide, in full sun to partial shade.
Set out 6–8 in apart, in full sun to partial shade; afternoon shade in hot climates extends the bloom season.
🛠️ Maintenance
Harden off and prep beds
Zone 10's last frost lands around now (Rare or none).
📌 Harden off indoor seedlings over 7–10 days, work compost into beds, and keep frost cloth handy for surprise late freezes.
When to plant this month's crops in Zone 10
Full planting calendars — start indoors, transplant, and harvest timing — for the crops you're planting in January.
General January tasks
These apply broadly regardless of zone — a useful checklist alongside the zone-specific tasks above.
- ✓Order seeds from catalogs and plan crop rotations
- ✓Inventory stored seeds and discard those past their viability window
- ✓Start onion and leek seeds indoors (cold zones)
- ✓Prune dormant fruit trees and grape vines
- ✓Apply dormant oil sprays to fruit trees before buds swell
- ✓Sharpen and oil garden tools
- ✓Turn compost pile if not frozen
- ✓Plan raised bed improvements and new garden layouts
⚠ Watch-outs for January
- ⚠Protect brassicas and root vegetables from hard freezes in Zones 7–8 with row covers
- ⚠Check overwintering bulbs in storage for rot or desiccation
- ⚠Avoid walking on frozen or waterlogged soil — it compacts severely
- ⚠Monitor houseplants for pests that thrive in dry indoor winter conditions
January in Zone 10: common questions
What can I plant in January in Zone 10?＋
In January, Zone 10 gardeners can sow or transplant Tomatoes, Tomatillos, Broccoli, Cabbage, Basil, Marigolds, Watermelon, and Kohlrabi. January in Zone 10 (last frost rare or none, first frost rare — december to january in coldest years). There are 44 crops to sow, transplant, or harvest this month.
When is the last and first frost in Zone 10?＋
Zone 10 typically has its last spring frost around Rare or none and its first fall frost around Rare — December to January in coldest years, giving a growing season of roughly 330–365 days. Always check a local frost-date source, since microclimates vary.
What garden jobs matter most in January in Zone 10?＋
Focus on order seeds from catalogs and plan crop rotations, inventory stored seeds and discard those past their viability window, start onion and leek seeds indoors (cold zones). Watch out for protect brassicas and root vegetables from hard freezes in zones 7–8 with row covers.